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Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
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1

Interaction of trapped ions with trapped atoms  

E-Print Network (OSTI)

In this thesis, I present results from two Paul-trap based ion traps carried out in the Vuleti? laboratory: the Atom-Ion trap for collision studies between cold atoms and cold ions, and the Cavity-Array trap for studying ...

Grier, Andrew T. (Andrew Todd)

2011-01-01T23:59:59.000Z

2

Laser cooling and trapping of neutral atoms*  

Science Conference Proceedings (OSTI)

... 1 m/s, any gas in equilibrium (other than spin-polarized atomic hydro- ... lattice-trapped atoms, a physical picture with the simplicity and power of the ...

2010-08-23T23:59:59.000Z

3

Trapping Rydberg Atoms in an Optical Lattice  

Science Conference Proceedings (OSTI)

Rubidium Rydberg atoms are laser excited and subsequently trapped in a one-dimensional optical lattice (wavelength 1064 nm). Efficient trapping is achieved by a lattice inversion immediately after laser excitation using an electro-optic technique. The trapping efficiency is probed via analysis of the trap-induced shift of the two-photon microwave transition 50S{yields}51S. The inversion technique allows us to reach a trapping efficiency of 90%. The dependence of the efficiency on the timing of the lattice inversion and on the trap laser power is studied. The dwell time of 50D{sub 5/2} Rydberg atoms in the lattice is analyzed using lattice-induced photoionization.

Anderson, S. E.; Younge, K. C.; Raithel, G. [FOCUS Center, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)

2011-12-23T23:59:59.000Z

4

Bon MOT: Innovative Atom Trap Catches Highly Magnetic ...  

Science Conference Proceedings (OSTI)

... of a cloud of erbium atoms trapped and cooled and a ... all the while extracting energy and cooling them ... only a single laser and can cool erbium atoms ...

2011-07-18T23:59:59.000Z

5

atomic  

NLE Websites -- All DOE Office Websites (Extended Search)

theory and fundamental quantum mechanics In addition to research on hadronic and nuclear physics, we also conduct research in atomic physics, neutron physics, and quantum...

6

The angular momentum of a magnetically trapped atomic condensate  

E-Print Network (OSTI)

For an atomic condensate in an axially symmetric magnetic trap, the sum of the axial components of the orbital angular momentum and the hyperfine spin is conserved. Inside an Ioffe-Pritchard trap (IPT) whose magnetic field (B-field) is not axially symmetric, the difference of the two becomes surprisingly conserved. In this paper we investigate the relationship between the values of the sum/difference angular momentums for an atomic condensate inside a magnetic trap and the associated gauge potential induced by the adiabatic approximation. Our result provides significant new insight into the vorticity of magnetically trapped atomic quantum gases.

P. Zhang; H. H. Jen; C. P. Sun; L. You

2006-11-14T23:59:59.000Z

7

Steven Chu: Laser Cooling and Trapping of Atoms  

NLE Websites -- All DOE Office Websites (Extended Search)

Steven Chu Steven Chu Laser Cooling and Trapping of Atoms Resources with Additional Information · Interviews, Speeches, and Presentations · Patents Steven Chu Photo Credit: Lawrence Berkeley National Laboratory Roy Kaltschmidt, Photographer Steven Chu was appointed by President Barack Obama to be the 12th Secretary of Energy and served in this capacity until April 22, 2013. He was previously Director of Lawrence Berkeley National Laboratory (LBNL), Professor in the Physics Department at the University of California, Berkeley, and 'the Theodore and Frances Geballe Professor of Physics and Applied Physics at Stanford University. Professor Chu's research is in atomic physics, polymer and biophysics. His thesis and postdoctoral work at Berkeley ... was the observation of parity non-conservation in atomic transitions in 1978. This experiment was one of the earliest atomic physics confirmations of the Weinberg-Salam-Glashow theory that unifies the weak and electromagnetic forces.

8

Steven Chu: Laser Cooling and Trapping of Atoms  

Office of Scientific and Technical Information (OSTI)

Steven Chu Steven Chu Laser Cooling and Trapping of Atoms Resources with Additional Information · Interviews, Speeches, and Presentations · Patents Steven Chu Photo Credit: Lawrence Berkeley National Laboratory Roy Kaltschmidt, Photographer Steven Chu was appointed by President Barack Obama to be the 12th Secretary of Energy and served in this capacity until April 22, 2013. He was previously Director of Lawrence Berkeley National Laboratory (LBNL), Professor in the Physics Department at the University of California, Berkeley, and 'the Theodore and Frances Geballe Professor of Physics and Applied Physics at Stanford University. Professor Chu's research is in atomic physics, polymer and biophysics. His thesis and postdoctoral work at Berkeley ... was the observation of parity non-conservation in atomic transitions in 1978. This experiment was one of the earliest atomic physics confirmations of the Weinberg-Salam-Glashow theory that unifies the weak and electromagnetic forces.

9

Formation of Antihydrogen Rydberg atoms in strong magnetic field traps  

SciTech Connect

It is shown that several features of antihydrogen production in nested Penning traps can be described with accurate and efficient Monte Carlo simulations. It is found that cold deeply-bound Rydberg states of antihydrogen (H-bar) are produced in three-body capture in the ATRAP experiments and an additional formation mechanism -Rydberg charge transfer-, particular to the nested Penning trap geometry, is responsible for the observed fast (hot) H-bar atoms. Detailed description of the numerical propagation technique for following extreme close encounters is given. An analytic derivation of the power law behavior of the field ionization spectrum is provided.

Pohl, T.; Sadeghpour, H. R. [ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138 (United States)

2008-08-08T23:59:59.000Z

10

Atom trapping in a bottle beam created by a diffractive optical element  

E-Print Network (OSTI)

A diffractive optical element (DOE) has been fabricated for creating blue detuned atomic bottle beam traps. The DOE integrates several diffractive lenses for trap creation and imaging of atomic fluorescence. We characterize the performance of the DOE and demonstrate trapping of cold Cesium atoms inside a bottle beam.

V. V. Ivanov; J. A. Isaacs; M. Saffman; S. A. Kemme; A. R. Ellis; G. R. Brady; J. R. Wendt; G. W. Biedermann; S. Samora

2013-05-23T23:59:59.000Z

11

Atom trapping in a bottle beam created by a diffractive optical element  

E-Print Network (OSTI)

A diffractive optical element (DOE) has been fabricated for creating blue detuned atomic bottle beam traps. The DOE integrates several diffractive lenses for trap creation and imaging of atomic fluorescence. We characterize the performance of the DOE and demonstrate trapping of cold Cesium atoms inside a bottle beam.

Ivanov, V V; Saffman, M; Kemme, S A; Ellis, A R; Brady, G R; Wendt, J R; Biedermann, G W; Samora, S

2013-01-01T23:59:59.000Z

12

Dipole traps for neutral atoms formed by nonuniformly polarised Laguerre modes  

SciTech Connect

Field configurations of two counterpropagating nonuniformly polarised Laguerre modes forming three-dimensional dipole traps for neutral atoms are proposed. Peculiarities of the stochastic dynamics of atoms in such traps, associated with the anisotropy of dipole forces and manifestations of various radiative friction mechanisms are analysed. The problem of increasing the confinement time for atoms in such field configurations is studied. (laser applications and other topics in quantum electronics)

Bezverbny, Aleksandr V [Maritime State University, Vladivostok (Russian Federation); Niz'ev, Vladimir G [Institute on Laser and Information Technologies, Russian Academy of Sciences, Shatura, Moscow Region (Russian Federation); Tumaikin, Anatolii M [Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk (Russian Federation)

2004-07-31T23:59:59.000Z

13

Atom Trap Trace Analysis at ANL | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Atom Trap Trace Analysis at ANL Atom Trap Trace Analysis at ANL Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Spinoff Applications Spinoff Archives SBIR/STTR Applications of Nuclear Science and Technology Funding Opportunities Nuclear Science Advisory Committee (NSAC) News & Resources Contact Information Nuclear Physics U.S. Department of Energy SC-26/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3613 F: (301) 903-3833 E: sc.np@science.doe.gov More Information » Spinoff Archives Atom Trap Trace Analysis at ANL Print Text Size: A A A RSS Feeds FeedbackShare Page Application/instrumentation: Atom Trap Trace Analysis (ATTA) to determine isotopic abundances. Developed at: Argonne National Laboratory Developed in: 1999-current

14

Macroscopic two-state systems in trapped atomic condensates  

SciTech Connect

We consider a macroscopic two-state system based on persistent current states of a Bose-Einstein condensate (BEC) of interacting neutral atoms confined in a ring with a weak Josephson link. We demonstrate that macroscopic superpositions of different BEC flows are energetically favorable in this system. Moreover, a macroscopic two-state dynamics emerges in the low-energy limit. We also investigate fundamental limitations due to the noise inherent in the interacting BEC of Josephson-ring geometry. We show that the coherent macroscopic dynamics is readily measurable for an experimentally accessible range of parameters.

Solenov, Dmitry; Mozyrsky, Dmitry [Theoretical Division (T-4) and the Center for Nonlinear Studies (CNLS), Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2010-12-15T23:59:59.000Z

15

Design of a millimetre-scale magnetic surface trap for cold atoms  

E-Print Network (OSTI)

We study a novel millimetre-scale magnetic trap for ultracold atoms, in which the current carrying conductors can be situated outside the vacuum region, a few mm away from the atoms. This design generates a magnetic field gradient in excess of \\SI{1000}{G/cm} at a distance of \\SI{2}{mm} from the conductors. We perform electromagnetic and thermo-mechanical characterisation using Finite Element Methods (FEM). The predicted behaviour has been verified by electrical and thermal measurements on a prototype, but has not been implemented on an apparatus with cold atoms. Operating this trap at the highest gradient allows for rapid evaporative cooling comparable to that achieved by atom chips.

Trypogeorgos, Dimitris

2013-01-01T23:59:59.000Z

16

Onset of Fermi Degeneracy in a Trapped Atomic Gas  

Science Conference Proceedings (OSTI)

... in the total energy of the ultra- cold, trapped ... of charge e onto a cryogenic capacitor C, and ... standards are known as calculable capacitors and rely ...

2010-07-12T23:59:59.000Z

17

Coherence of a qubit stored in Zeeman levels of a single optically trapped atom  

E-Print Network (OSTI)

We experimentally investigate the coherence properties of a qubit stored in the Zeeman substates of the 5S1/2, F=1 hyperfine ground level of a single optically trapped Rb-87 atom. Larmor precession of a single atomic spin-1 system is observed by preparing the atom in a defined initial spin-state and then measuring the resulting state after a programmable period of free evolution. Additionally, by performing quantum state tomography, maximum knowledge about the spin coherence is gathered. By using an active magnetic field stabilization and without application of a magnetic guiding field we achieve transverse and longitudinal dephasing times of T2*=75..150 \\mus and T1>0.5 ms respectively. We derive the light-shift distribution of a single atom in the approximately harmonic potential of a dipole trap and show that the measured atomic spin coherence is limited mainly by residual position- and state-dependent effects in the optical trapping potential. The improved understanding enables longer coherence times, an important prerequisite for future applications in long-distance quantum communication and computation with atoms in optical lattices or for a loophole-free test of Bell's inequality.

Wenjamin Rosenfeld; Jrgen Volz; Markus Weber; Harald Weinfurter

2011-07-25T23:59:59.000Z

18

Coherence of a qubit stored in Zeeman levels of a single optically trapped atom  

E-Print Network (OSTI)

We experimentally investigate the coherence properties of a qubit stored in the Zeeman substates of the 5S1/2, F=1 hyperfine ground level of a single optically trapped Rb-87 atom. Larmor precession of a single atomic spin-1 system is observed by preparing the atom in a defined initial spin-state and then measuring the resulting state after a programmable period of free evolution. Additionally, by performing quantum state tomography, maximum knowledge about the spin coherence is gathered. By using an active magnetic field stabilization and without application of a magnetic guiding field we achieve transverse and longitudinal dephasing times of T2*=75..150 \\mus and T1>0.5 ms respectively. We derive the light-shift distribution of a single atom in the approximately harmonic potential of a dipole trap and show that the measured atomic spin coherence is limited mainly by residual position- and state-dependent effects in the optical trapping potential. The improved understanding enables longer coherence times, an i...

Rosenfeld, Wenjamin; Weber, Markus; Weinfurter, Harald

2011-01-01T23:59:59.000Z

19

PHYSICAL REVIEW A 84, 022343 (2011) Coherence of a qubit stored in Zeeman levels of a single optically trapped atom  

E-Print Network (OSTI)

experimentally investigate the coherence properties of a qubit stored in the Zeeman substates of the 52 S1/2, F = 1 hyperfine ground level of a single optically trapped 87 Rb atom. Larmor precession of a single and the quantum repeater [1]. There, ground states of trapped atoms or ions are ideal candidates

Weinfurter, Harald

20

High-Resolution Imaging and Optical Control of Bose-Einstein Condensates in an Atom Chip Magnetic Trap  

E-Print Network (OSTI)

A high-resolution projection and imaging system for ultracold atoms is implemented using a compound silicon and glass atom chip. The atom chip is metalized to enable magnetic trapping while glass regions enable high numerical aperture optical access to atoms residing in the magnetic trap about 100 microns below the chip surface. The atom chip serves as a wall of the vacuum system, which enables the use of commercial microscope components for projection and imaging. Holographically generated light patterns are used to optically slice a cigar-shaped magnetic trap into separate regions; this has been used to simultaneously generate up to four Bose-condensates. Using fluorescence techniques we have demonstrated in-trap imaging resolution down to 2.5 microns

Evan A. Salim; Seth C. Caliga; Jonathan B. Pfeiffer; Dana Z. Anderson

2012-08-24T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Fermi excitations in a trapped atomic Fermi gas with a molecular Bose condensate  

E-Print Network (OSTI)

We discuss the effect of a molecular Bose condensate on the energy of Fermi excitations in a trapped two-component atomic Fermi gas. The single-particle Green's functions can be approximated by the well-known BCS form, in both the BCS (Cooper pairs) and BEC (Feshbach resonance molecules) domains. The composite Bose order parameter ${\\tilde \\Delta}$ describing bound states of two atoms and the Fermi chemical potential $\\mu$ are calculated self-consistently. In the BEC regime characterized by $\\muenergy gap is given by $\\sqrt{\\mu^2+{\\tilde \\Delta}^2}$, instead of $|{\\tilde \\Delta}|$ in the BCS region, where $\\mu>0$. This shows up in the characteristic energy of atoms from dissociated molecules.

Y. Ohashi; A. Griffin

2004-02-02T23:59:59.000Z

22

Narrow-line magneto-optical cooling and trapping of strongly magnetic atoms  

E-Print Network (OSTI)

Laser cooling on weak transitions is a useful technique for reaching ultracold temperatures in atoms with multiple valence electrons. However, for strongly magnetic atoms a conventional narrow-line magneto-optical trap (MOT) is destabilized by competition between optical and magnetic forces. We overcome this difficulty in Er by developing an unusual narrow-line MOT that balances optical and magnetic forces using laser light tuned to the blue side of a narrow (8 kHz) transition. The trap population is spin-polarized with temperatures reaching below 2 microkelvin. Our results constitute an alternative method for laser cooling on weak transitions, applicable to rare-earth-metal and metastable alkaline earth elements.

Berglund, Andrew J; McClelland, Jabez J

2008-01-01T23:59:59.000Z

23

Narrow-line magneto-optical cooling and trapping of strongly magnetic atoms  

E-Print Network (OSTI)

Laser cooling on weak transitions is a useful technique for reaching ultracold temperatures in atoms with multiple valence electrons. However, for strongly magnetic atoms a conventional narrow-line magneto-optical trap (MOT) is destabilized by competition between optical and magnetic forces. We overcome this difficulty in Er by developing an unusual narrow-line MOT that balances optical and magnetic forces using laser light tuned to the blue side of a narrow (8 kHz) transition. The trap population is spin-polarized with temperatures reaching below 2 microkelvin. Our results constitute an alternative method for laser cooling on weak transitions, applicable to rare-earth-metal and metastable alkaline earth elements.

Andrew J. Berglund; James L. Hanssen; Jabez J. McClelland

2008-02-06T23:59:59.000Z

24

Influence of trapping potentials on the phase diagram of bosonic atoms in optical lattices  

SciTech Connect

We study the effect of external trapping potentials on the phase diagram of bosonic atoms in optical lattices. We introduce a generalized Bose-Hubbard Hamiltonian that includes the structure of the energy levels of the trapping potential, and show that these levels are in general populated both at finite and zero temperature. We characterize the properties of the superfluid transition for this situation and compare them with those of the standard Bose-Hubbard description. We briefly discuss similar behaviors for fermionic systems.

Giampaolo, S.M.; Illuminati, F.; Mazzarella, G.; De Siena, S. [Dipartimento di Fisica 'E. R. Caianiello', Universita di Salerno, INFM UdR di Salerno, INFN Sezione di Napoli-Gruppo Collegato di Salerno, I-84081 Baronissi, SA (Italy)

2004-12-01T23:59:59.000Z

25

Influence of trapping potentials on the phase diagram of bosonic atoms in optical lattices  

E-Print Network (OSTI)

We study the effect of external trapping potentials on the phase diagram of bosonic atoms in optical lattices. We introduce a generalized Bose-Hubbard Hamiltonian that includes the structure of the energy levels of the trapping potential, and show that these levels are in general populated both at finite and zero temperature. We characterize the properties of the superfluid transition for this situation and compare them with those of the standard Bose-Hubbard description. We briefly discuss similar behaviors for fermionic systems.

S. M. Giampaolo; F. Illuminati; G. Mazzarella; S. De Siena

2004-03-04T23:59:59.000Z

26

Controlled photon emission and Raman transition experiments with a single trapped atom  

E-Print Network (OSTI)

We present recent results on the coherent control of an optical transition in a single rubidium atom, trapped in an optical tweezer. We excite the atom using resonant light pulses that are short (4 ns) compared with the lifetime of the excited state (26 ns). By varying the intensity of the laser pulses, we can observe an adjustable number of Rabi oscillations, followed by free decay once the light is switched off. To generate the pulses we have developed a novel laser system based on frequency doubling a telecoms laser diode at 1560 nm. By setting the laser intensity to make a pi-pulse, we use this coherent control to make a high quality triggered source of single photons. We obtain an average single photon rate of 9600 s-1 at the detector. Measurements of the second-order temporal correlation function show almost perfect antibunching at zero delay. In addition, we present preliminary results on the use of Raman transitions to couple the two hyperfine levels of the ground state of our trapped atom. This will allow us to prepare and control a qubit formed by two hyperfine sub-levels.

M. P. A. Jones; B. Darquie; J. Beugnon; J. Dingjan; S. Bergamini; Y. Sortais; G. Messin; A. Browaeys; P. Grangier

2005-08-16T23:59:59.000Z

27

Atomic History  

Science Conference Proceedings (OSTI)

... These Data Centers, one on Atomic Energy Levels and one on Atomic Transition ... After a few years Kessler went on to higher management at NIST. ...

2010-10-05T23:59:59.000Z

28

The on-line charge breeding program at TRIUMF's Ion Trap For Atomic and Nuclear Science for precision mass measurements  

Science Conference Proceedings (OSTI)

TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) constitutes the only high precision mass measurement setup coupled to a rare isotope facility capable of increasing the charge state of short-lived nuclides prior to the actual mass determination in a Penning trap. Recent developments around TITAN's charge breeder, the electron beam ion trap, form the basis for several successful experiments on radioactive isotopes with half-lives as low as 65 ms and in charge states as high as 22+.

Simon, M. C.; Eberhardt, B.; Jang, F.; Luichtl, M.; Robertson, D.; Chaudhuri, A.; Delheij, P.; Grossheim, A.; Kwiatkowski, A. A.; Mane, E.; Pearson, M. R.; Schultz, B. E. [TRIUMF, Vancouver, British Columbia V6T 2A3 (Canada); Bale, J. C. [TRIUMF, Vancouver, British Columbia V6T 2A3 (Canada); Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6 (Canada); Chowdhury, U. [TRIUMF, Vancouver, British Columbia V6T 2A3 (Canada); Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada); Ettenauer, S.; Gallant, A. T.; Dilling, J. [TRIUMF, Vancouver, British Columbia V6T 2A3 (Canada); Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1 (Canada); Lennarz, A. [TRIUMF, Vancouver, British Columbia V6T 2A3 (Canada); Institut fuer Kernphysik, Westfaelische Wilhelms-Universitaet, D-48149 Muenster (Germany); Ma, T.; Andreoiu, C. [Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6 (Canada); and others

2012-02-15T23:59:59.000Z

29

Atom Trap Trace Analysis at ANL | U.S. DOE Office of Science...  

Office of Science (SC) Website

atoms of the more common isotope found in nature. The device has uses for dating ice and water for geological studies, or monitoring nuclear waste in the environment. 81Kr...

30

Photoionization of optically trapped ultracold atoms with a high-power light-emitting diode  

SciTech Connect

Photoionization of laser-cooled atoms using short pulses of a high-power light-emitting diode (LED) is demonstrated. Light pulses as short as 30 ns have been realized with the simple LED driver circuit. We measure the ionization cross section of {sup 85}Rb atoms in the first excited state, and show how this technique can be used for calibrating efficiencies of ion detector assemblies.

Goetz, Simone; Hoeltkemeier, Bastian; Amthor, Thomas; Weidemueller, Matthias [Physikalisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg (Germany)

2013-04-15T23:59:59.000Z

31

Unfaulting mechanism of trapped self-interstitial atom clusters in bcc Fe: A kinetic study based on the potential energy landscape  

E-Print Network (OSTI)

We report on the complete unfaulting mechanism of a trapped self-interstitial atom cluster in the form of a nonparallel configuration (NPC), investigated using the autonomous basin climbing (ABC) method. A detailed set of ...

Yildiz, Bilge

32

Locating strongly coupled color superconductivity using universality and experiments with trapped ultracold atoms  

E-Print Network (OSTI)

Cold fermionic atoms are known to enter the universal strongly coupled regime as their scattering length $a$ gets large compared to the inter-particle distances. Recent experimental data provide important critical parameters of such system. We argue that quarks may enter the same regime due to marginal binding of diquarks, and if so one can use its universality in order to deduce such properties as the slope of the critical line of color superconductivity, $dT_c/d\\mu$. We further discuss limitations on the critical temperature itself and conclude that it is limited by $T_c<70\\, MeV$.

E. V. Shuryak

2006-06-21T23:59:59.000Z

33

Glossary Term - Atomic Number  

NLE Websites -- All DOE Office Websites (Extended Search)

Particle Previous Term (Alpha Particle) Glossary Main Index Next Term (Avogadro's Number) Avogadro's Number Atomic Number Silver's atomic number is 47 The atomic number is equal to...

34

Quantum anomalous Hall effect with cold atoms trapped in a square lattice  

E-Print Network (OSTI)

We propose an experimental scheme to realize the quantum anomalous Hall effect in an anisotropic square optical lattice which can be generated from available experimental setups of double-well lattices with minor modifications. A periodic gauge potential induced by atom-light interaction is introduced to give a Peierls phase for the nearest-neighbor site hopping. The quantized anomalous Hall conductivity is investigated by calculating the Chern number as well as the chiral gapless edge states of our system. Furthermore, we show in detail the feasability for its experimental detection through light Bragg scattering of the edge and bulk states with which one can determine the topological phase transition from usual insulating phase to quantum anomalous Hall phase.

Liu, Xiong-Jun; Liu, Xin; Wu, Congjun; Sinova, Jairo

2010-01-01T23:59:59.000Z

35

Atomic Spectroscopy Data Center  

Science Conference Proceedings (OSTI)

Atomic Spectroscopy Data Center. Summary: ... Atomic Spectroscopy Data Webpage. End Date: ongoing. Lead Organizational Unit: physlab. Contact. ...

2013-06-06T23:59:59.000Z

36

Atomic magnetometer  

SciTech Connect

An atomic magnetometer is disclosed which uses a pump light beam at a D1 or D2 transition of an alkali metal vapor to magnetically polarize the vapor in a heated cell, and a probe light beam at a different D2 or D1 transition to sense the magnetic field via a polarization rotation of the probe light beam. The pump and probe light beams are both directed along substantially the same optical path through an optical waveplate and through the heated cell to an optical filter which blocks the pump light beam while transmitting the probe light beam to one or more photodetectors which generate electrical signals to sense the magnetic field. The optical waveplate functions as a quarter waveplate to circularly polarize the pump light beam, and as a half waveplate to maintain the probe light beam linearly polarized.

Schwindt, Peter (Albuquerque, NM); Johnson, Cort N. (Albuquerque, NM)

2012-07-03T23:59:59.000Z

37

Atom-light interactions in ultracold anisotropic media  

E-Print Network (OSTI)

A series of studies on atom-light interactions in ultracold anisotropic media were conducted. Methods to trap ultracold neutral atoms in novel traps with widely tunable trap frequencies and anisotropies were investigated. ...

Vengalattore, Mukund T., 1977-

2005-01-01T23:59:59.000Z

38

NIST Atomic Physics Division 2000 - Current Directions  

Science Conference Proceedings (OSTI)

... Although these data are needed for magnetic fusion research, astronomy, and industry, there is ... Physics of Cold, Trapped Gases of Neutral Atoms. ...

39

Magnetometry with entangled atomic samples  

E-Print Network (OSTI)

We present a theory for the estimation of a scalar or a vector magnetic field by its influence on an ensemble of trapped spin polarized atoms. The atoms interact off-resonantly with a continuous laser field, and the measurement of the polarization rotation of the probe light, induced by the dispersive atom-light coupling, leads to spin-squeezing of the atomic sample which enables an estimate of the magnetic field which is more precise than that expected from standard counting statistics. For polarized light and polarized atoms, a description of the non-classical components of the collective spin angular momentum for the atoms and the collective Stokes vectors of the light-field in terms of effective gaussian position and momentum variables is practically exact. The gaussian formalism describes the dynamics of the system very effectively and accounts explicitly for the back-action on the atoms due to measurement and for the estimate of the magnetic field. Multi-component magnetic fields are estimated by the measurement of suitably chosen atomic observables and precision and efficiency is gained by dividing the atomic gas in two or more samples which are entangled by the dispersive atom-light interaction.

Vivi Petersen; Lars Bojer Madsen; Klaus Molmer

2004-09-28T23:59:59.000Z

40

Reading Comprehension - Atomic History  

NLE Websites -- All DOE Office Websites (Extended Search)

Atomic History Atomic History A Greek philosopher named Democritus said that all atoms are small, hard particles. He thought that atoms were made of a single material formed into different shapes and sizes. The word " _________ element compound mixture atom " is derived from the Greek word "atomos" which means "not able to be divided." In 1803, John Dalton, a school teacher, proposed his atomic theory. Dalton's theory states that elements (substances composed of only one type of _________ molecules ions atom ) combine in certain proportions to form _________ compounds atoms mixtures elements . In 1897, a British scientist named J. J. Thomson experimented with a cathode-ray tube which had a positively charged plate. The plate attracted negatively charged particles that we now call _________ protons neutrons

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

The Universe Adventure - Atoms  

NLE Websites -- All DOE Office Websites (Extended Search)

Matter and Atoms Matter and Atoms Richard Feynman "If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generations of creatures, what statement would contain the most information in the fewest words? I believe it is that...all things are made of atoms." -Richard P. Feynman, winner of the 1965 Nobel Prize in Physics All is atoms Matter is made of atoms, and atoms are comprised of protons, neutrons, and electrons. Everything in the Universe is made of matter. Though matter exists in many different forms, each form is made out of the same basic constituents: small particles called atoms. Atoms themselves are made of smaller particles: protons, neutrons, and electrons. Protons and neutrons are composed of even smaller particles called quarks.

42

Atomic and Molecular Physics  

Science Conference Proceedings (OSTI)

... DG, * SRD 105 Physic Laboratory's Elemental ... Nuclear Physics SRD 144 Atomic Weights & ... Physical Constants SRD 121 Fundamental Physical ...

2012-10-10T23:59:59.000Z

43

Atomizing nozzle and process  

DOE Patents (OSTI)

High pressure atomizing nozzle includes a high pressure gas manifold having a divergent expansion chamber between a gas inlet and arcuate manifold segment to minimize standing shock wave patterns in the manifold and thereby improve filling of the manifold with high pressure gas for improved melt atomization. The atomizing nozzle is especially useful in atomizing rare earth-transition metal alloys to form fine powder particles wherein a majority of the powder particles exhibit particle sizes having near-optimum magnetic properties.

Anderson, I.E.; Figliola, R.S.; Molnar, H.M.

1993-07-20T23:59:59.000Z

44

Calibrated Atomic Force Microscopy  

Science Conference Proceedings (OSTI)

... Vorburger, SL Tan, NG Orji, J. Fu, Interlaboratory Comparison of Traceable Atomic Force Microscope Pitch Measurements, SPIE Proceedings Vol. ...

2011-10-28T23:59:59.000Z

45

Test of the quantumness of atom-atom correlations in a bosonic gas  

E-Print Network (OSTI)

It is shown how the quantumness of atom-atom correlations in a trapped bosonic gas can be made observable. Application of continuous feedback control of the center of mass of the atomic cloud is shown to generate oscillations of the spatial extension of the cloud, whose amplitude can be directly used as a characterization of atom-atom correlations. Feedback parameters can be chosen such that the violation of a Schwarz inequality for atom-atom correlations can be tested at noise levels much higher than the standard quantum limit.

D. Ivanov; S. Wallentowitz

2006-03-16T23:59:59.000Z

46

Atomic Data for Mercury (Hg)  

Science Conference Proceedings (OSTI)

... Mercury (Hg) Homepage - Introduction Finding list Select element by name. Select element by atomic number. ... Atomic Data for Mercury (Hg). ...

47

Atomic Data for Plutonium (Pu)  

Science Conference Proceedings (OSTI)

... Plutonium (Pu) Homepage - Introduction Finding list Select element by name. Select element by atomic number. ... Atomic Data for Plutonium (Pu). ...

48

Atomic Data for Tungsten (W )  

Science Conference Proceedings (OSTI)

... Tungsten (W) Homepage - Introduction Finding list Select element by name. Select element by atomic number. ... Atomic Data for Tungsten (W). ...

49

Atomic Data for Uranium (U )  

Science Conference Proceedings (OSTI)

... Uranium (U) Homepage - Introduction Finding list Select element by name. Select element by atomic number. ... Atomic Data for Uranium (U). ...

50

Atomic Data for Hydrogen (H )  

Science Conference Proceedings (OSTI)

... Hydrogen (H) Homepage - Introduction Finding list Select element by name. Select element by atomic number. ... Atomic Data for Hydrogen (H). ...

51

Atomic Data for Thorium (Th)  

Science Conference Proceedings (OSTI)

... Thorium (Th) Homepage - Introduction Finding list Select element by name. Select element by atomic number. ... Atomic Data for Thorium (Th). ...

52

ATOMS PEACE WAR Eisenhower  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

ATOMS ATOMS PEACE WAR Eisenhower and the Atomic Energy Commission Richard G. Hewlett and lack M. Roll With a Foreword by Richard S. Kirkendall and an Essay on Sources by Roger M. Anders University of California Press Berkeley Los Angeles London Published 1989 by the University of California Press Berkeley and Los Angeles, California University of California Press, Ltd. London, England Prepared by the Atomic Energy Commission; work made for hire. Library of Congress Cataloging-in-Publication Data Hewlett, Richard G. Atoms for peace and war, 1953-1961. (California studies in the history of science) Bibliography: p. Includes index. 1. Nuclear energy-United States-History. 2. U.S. Atomic Energy Commission-History. 3. Eisenhower, Dwight D. (Dwight David), 1890-1969.

53

Metal atom oxidation laser  

DOE Patents (OSTI)

A chemical laser which operates by formation of metal or carbon atoms and reaction of such atoms with a gaseous oxidizer in an optical resonant cavity is described. The lasing species are diatomic or polyatomic in nature and are readily produced by exchange or other abstraction reactions between the metal or carbon atoms and the oxidizer. The lasing molecules may be metal or carbon monohalides or monoxides. (auth)

Jensen, R.J.; Rice, W.W.; Beattie, W.H.

1975-10-28T23:59:59.000Z

54

Metal atom oxidation laser  

DOE Patents (OSTI)

A chemical laser which operates by formation of metal or carbon atoms and reaction of such atoms with a gaseous oxidizer in an optical resonant cavity is described. The lasing species are diatomic or polyatomic in nature and are readily produced by exchange or other abstraction reactions between the metal or carbon atoms and the oxidizer. The lasing molecules may be metal or carbon monohalides or monoxides.

Jensen, R.J.; Rice, W.W.; Beattie, W.H.

1975-10-28T23:59:59.000Z

55

Atomic Spectroscopy: An Introduction  

Science Conference Proceedings (OSTI)

... 60. A. de-Shalit and I. Talmi, Nuclear Shell Theory (Academic, New York, 1963). ... CE Moore, Atomic Energy Levels, Natl. Stand. Ref. ...

56

NIST Atomic Spectra Database  

Science Conference Proceedings (OSTI)

... Ground states and ionization energies of atoms ... the US Department of Energy, by the ... SRDP), and by NIST's Systems Integration for Manufacturing ...

2013-09-12T23:59:59.000Z

57

Cold Atoms News  

Science Conference Proceedings (OSTI)

... the first time caused a gas of atoms ... mysterious data in ultracold gases of rubidium ... Material May Demonstrate Long-Sought 'Liquid' Magnetic State ...

2010-10-20T23:59:59.000Z

58

Atomic Collapse Observed  

NLE Websites -- All DOE Office Websites (Extended Search)

Collapse State Observed Aided by Simulations, Scientists Observe Atomic Collapse State Quantum Mechanics Prediction Confirmed in Graphene Using NERSC's Hopper April 26, 2013 |...

59

The Harnessed Atom  

Energy.gov (U.S. Department of Energy (DOE))

The Harnessed Atom is a new middle school science, technology, engineering, and math (STEM) curriculum extension that focuses on nuclear science and energy. It offers teachers accurate, unbiased,...

60

An atom---molecule platform for quantum computing  

Science Conference Proceedings (OSTI)

We propose a combined atom---molecule system for quantum information processing in individual traps, such as provided by optical lattices. In this platform, different species of atoms--one atom carrying a qubit and the other enabling the interaction--are ... Keywords: Dipole-dipole interaction, Neutral atom quantum computing, Optical lattices, Polar molecules

Elena Kuznetsova; S. F. Yelin; Robin Ct

2011-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Materials' Deformation Dynamics at Atomic Scale In situ Atomic ...  

Science Conference Proceedings (OSTI)

Presentation Title, Materials' Deformation Dynamics at Atomic Scale In situ Atomic .... What Can We Learn from Measurements of Li-ion Battery Single Particles?

62

general_atomics.cdr  

NLE Websites -- All DOE Office Websites (Extended Search)

former former General Atomics Hot Cell Facility was constructed in 1959 and operated until 1991. The site encompassed approximately 7,400 square feet of laboratory and remote operations cells. Licensed operations at the facility included receipt, handling, and shipment of radioactive materials; remote handling, examination, and storage of previously irradiated nuclear fuel materials; pilot-scale tritium extraction operations; and development, fabrication, and inspection of uranium oxide-beryllium oxide fuel materials. General Atomics performed most of the work for the federal government. The General Atomics Hot Cell Facility was located in a 60-acre complex 13 miles northwest of downtown San Diego, 1 mile inland from the Pacific Ocean, and approximately 300 feet above sea level. The General Atomics site is in the center of Torrey Mesa Science Center, a 304-acre industrial

63

general_atomics.cdr  

Office of Legacy Management (LM)

from the U.S. Department of Energy (DOE). Discussions between DOE and General Atomics led to an agreed cost-sharing and no-fee arrangement for the decontamination and site...

64

Sharing the atom bomb  

Science Conference Proceedings (OSTI)

Shaken by the devastation of Hiroshima and Nagasaki and fearful that the American atomic monopoly would spark an arms race, Dean Acheson led a push in 1946 to place the bomb-indeed, all atomic energy-under international control. But as the memories of wartime collaboration faded, relations between the superpowers grew increasingly tense, and the confrontational atmosphere undid his proposal. Had Acheson succeeded, the Cold War might not have been. 2 figs.

Chace, J.

1996-01-01T23:59:59.000Z

65

Metal atomization spray nozzle  

DOE Patents (OSTI)

A spray nozzle for a magnetohydrodynamic atomization apparatus has a feed passage for molten metal and a pair of spray electrodes mounted in the feed passage. The electrodes, diverging surfaces which define a nozzle throat and diverge at an acute angle from the throat. Current passes through molten metal when fed through the throat which creates the Lorentz force necessary to provide atomization of the molten metal.

Huxford, Theodore J. (Harriman, TN)

1993-01-01T23:59:59.000Z

66

Metal atomization spray nozzle  

DOE Patents (OSTI)

A spray nozzle for a magnetohydrodynamic atomization apparatus has a feed passage for molten metal and a pair of spray electrodes mounted in the feed passage. The electrodes, diverging surfaces which define a nozzle throat and diverge at an acute angle from the throat. Current passes through molten metal when fed through the throat which creates the Lorentz force necessary to provide atomization of the molten metal. 6 figures.

Huxford, T.J.

1993-11-16T23:59:59.000Z

67

Effects of atomic radiation  

SciTech Connect

This book focuses on the lifelong effects of atomic radiation exposure in language understandable by the concerned layperson or the specialist in another field. The base of knowledge used is the work of the Atomic Bomb Casualty Commission and its successor since 1975 the Radiation Effects Research Foundation. Within the range of Chronic effects on human health the book provides a thorough review, although effects of nonionizing radiation, effects on structures, effects on other living species, and acute effects are not discussed.

Schull, W.J.

1995-12-31T23:59:59.000Z

68

Atomizing nozzle and method  

DOE Patents (OSTI)

A high pressure close-coupled gas atomizing nozzle includes multiple discrete gas jet discharge orifices having aerodynamically designed convergent-divergent geometry with an first converging section communicated to a gas supply manifold and to a diverging section by a constricted throat section to increase atomizing gas velocity. The gas jet orifices are oriented at gas jet apex angle selected relative to the melt supply tip apex angle to establish a melt aspiration condition at the melt supply tip.

Ting, Jason (Ames, IA); Anderson, Iver E. (Ames, IA); Terpstra, Robert L. (Ames, IA)

2000-03-16T23:59:59.000Z

69

NIST Physicists 'Entangle' Two Atoms Using Microwaves for ...  

Science Conference Proceedings (OSTI)

... electrically charged atoms) are trapped by electric fields and ... three thick electrodes at the lower right. ... Low-power ultraviolet lasers are still needed to ...

2011-08-10T23:59:59.000Z

70

Thousands of Atoms Swap 'Spins' in Quantum Square Dance  

Science Conference Proceedings (OSTI)

... and light, quantum computers might provide extraordinary power for applications ... rubidium atoms trapped within a three-dimensional grid of light ...

2013-07-08T23:59:59.000Z

71

Atomic Data for Americium (Am)  

Science Conference Proceedings (OSTI)

... Atomic Number = 95. Atomic Weight = (243). Reference E95. Isotope, Mass, Abundance, Spin, Mag Moment, 241 Am, 241.056823, 0, 5/2, +1.61. ...

72

Cavity cooling of a single atom  

E-Print Network (OSTI)

All conventional methods to laser-cool atoms rely on repeated cycles of optical pumping and spontaneous emission of a photon by the atom. Spontaneous emission in a random direction is the dissipative mechanism required to remove entropy from the atom. However, alternative cooling methods have been proposed for a single atom strongly coupled to a high-finesse cavity; the role of spontaneous emission is replaced by the escape of a photon from the cavity. Application of such cooling schemes would improve the performance of atom cavity systems for quantum information processing. Furthermore, as cavity cooling does not rely on spontaneous emission, it can be applied to systems that cannot be laser-cooled by conventional methods; these include molecules (which do not have a closed transition) and collective excitations of Bose condensates, which are destroyed by randomly directed recoil kicks. Here we demonstrate cavity cooling of single rubidium atoms stored in an intracavity dipole trap. The cooling mechanism res...

Maunz, P; Schuster, I; Syassen, N; Pinkse, P W H; Rempe, G

2004-01-01T23:59:59.000Z

73

Questions and Answers - How do atoms form?  

NLE Websites -- All DOE Office Websites (Extended Search)

(Biggest and smallest atom?) Questions and Answers Main Index Next Question (Does gravity affect atoms?) Does gravity affect atoms? How do atoms form? The current view is that...

74

Questions and Answers - Can you crush atoms?  

NLE Websites -- All DOE Office Websites (Extended Search)

Does gravity affect atoms? Previous Question (Does gravity affect atoms?) Questions and Answers Main Index Next Question (Parts and weights of atoms?) Parts and weights of atoms?...

75

Peaceful Uses of the Atom and Atoms for Peace  

Office of Scientific and Technical Information (OSTI)

Peaceful Uses of the Atom Peaceful Uses of the Atom Fermi and Atoms for Peace · Understanding the Atom · Seaborg · Teller Atoms for Peace Atoms for Peace + 50 - Conference, October 22, 2003 Celebrating the 50th anniversary of President Eisenhower's "Atoms for Peace" speech to the UN General Assembly Atoms for Peace (video 12:00 Minutes) Atoms for Peace Address given by Dwight D. Eisenhower before the General Assembly of the United Nations, New York City, December 8, 1953 Documents: Atomic Power in Space: A History A history of the Space Isotope Power Program of the United States from the mid-1950s through 1982; interplanetary space exploration successes and achievements have been made possible by this technology. Establishing Site X: Letter, Arthur H. Compton to Enrico Fermi, September 14, 1942

76

NIST Atomic Spectroscopy Data Center  

Science Conference Proceedings (OSTI)

Atomic Spectroscopy Data Center. ... Responds to user requests for data, literature references, and technical information. ...

2011-11-29T23:59:59.000Z

77

Lesson 3- Atoms and Isotopes  

Energy.gov (U.S. Department of Energy (DOE))

Youve probably heard people refer to nuclear energy as atomic energy. Why? Nuclear energy is the energy that is stored in the bonds of atoms, inside the nucleus. Nuclear power plants are designed to capture this energy as heat and convert it to electricity. This lesson looks closely at what atoms are and how atoms store energy.

78

general_atomics.cdr  

Office of Legacy Management (LM)

former General former General Atomics Hot Cell Facility was constructed in 1959 and operated until 1991. The site encompassed approximately 7,400 square feet of laboratory and remote operations cells. Licensed operations at the facility included receipt, handling, and shipment of radioactive materials; remote handling, examination, and storage of previously irradiated nuclear fuel materials; pilot-scale tritium extraction operations; and development, fabrication, and inspection of uranium oxide-beryllium oxide fuel materials. General Atomics performed most of the work for the federal government. The General Atomics Hot Cell Facility was located in a 60-acre complex 13 miles northwest of downtown San Diego, 1 mile inland from the Pacific Ocean, and approximately 300 feet above sea level.

79

Radioactive Background Evaluation by Atom Counting  

SciTech Connect

We propose a new method of measuring 85Kr background levels by direct counting of impurity atoms. The beta-decay of 85Kr is a significant radioactive background for experiments that use liquified noble gases to search for dark matter and measure the low-energy solar neutrino flux. While there are several proposed methods for reducing Kr levels in these experiments, an independent technique is needed for measuring very low Kr levels. By selectively exciting Kr atoms to a metastable state, capturing them in a magneto-optical trap (MOT), and detecting fluorescence from the trapped atoms, individual Kr atoms can be counted with a high signal-to-noise ratio. This approach offers both higher sensitivity and shorter measurement times than more conventional techniques, with an estimated sensitivity of 3 x 10-14 in only 3 hours of integration.

Orzel, Chad [Department of Physics and Astronomy, Union College, Schenectady, NY 12308 (United States); McKinsey, Daniel [Yale University, New Haven, CT 06511 (United States)

2005-09-08T23:59:59.000Z

80

JILA Researchers Discover Atomic Clock Can Simulate ...  

Science Conference Proceedings (OSTI)

... Artist's conception of interactions among atoms in JILA's strontium atomic clock during a quantum simulation experiment. ...

2013-08-20T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Fast transport, atom sample splitting, and single-atom qubit supply in two-dimensional arrays of optical microtraps  

E-Print Network (OSTI)

Two-dimensional arrays of optical micro-traps created by microoptical elements present a versatile and scalable architecture for neutral atom quantum information processing, quantum simulation, and the manipulation of ultra-cold quantum gases. In this article, we demonstrate advanced capabilities of this approach by introducing novel techniques and functionalities as well as the combined operation of previously separately implemented functions. We introduce piezo-actuator based transport of atom ensembles over distances of more than one trap separation, examine the capabilities of rapid atom transport provided by acousto-optical beam steering, and analyze the adiabaticity limit for atom transport in these configurations. We implement a spatial light modulator with 8-bit transmission control for the per-site adjustment of the trap depth and the number of atoms loaded. We combine single-site addressing, trap depth control, and atom transport in one configuration for demonstrating the splitting of atom ensembles with variable ratio at predefined register sites. Finally, we use controlled sub-poissonian preparation of single trapped atoms from such an ensemble to show that our approach allows for the implementation of a continuous supply of single-atom qubits with high fidelity. These novel implementations and their combined operation significantly extend available techniques for the dynamical and reconfigurable manipulation of ultracold atoms in dipole traps.

Malte Schlosser; Jens Kruse; Christian Gierl; Stephan Teichmann; Sascha Tichelmann; Gerhard Birkl

2013-01-07T23:59:59.000Z

82

Atom-photon entanglement generation and distribution  

E-Print Network (OSTI)

We extend an earlier model by Law {\\it et al.} \\cite{law} for a cavity QED based single-photon-gun to atom-photon entanglement generation and distribution. We illuminate the importance of a small critical atom number on the fidelity of the proposed operation in the strong coupling limit. Our result points to a promisingly high purity and efficiency using currently available cavity QED parameters, and sheds new light on constructing quantum computing and communication devices with trapped atoms and high Q optical cavities.

B. Sun; M. S. Chapman; L. You

2003-08-31T23:59:59.000Z

83

Nano Positioning of Single Atoms in a Micro Cavity  

E-Print Network (OSTI)

The coupling of individual atoms to a high-finesse optical cavity is precisely controlled and adjusted using a standing-wave dipole-force trap, a challenge for strong atom-cavity coupling. Ultracold Rubidium atoms are first loaded into potential minima of the dipole trap in the center of the cavity. Then we use the trap as a conveyor belt that we set into motion perpendicular to the cavity axis. This allows us to repetitively move atoms out of and back into the cavity mode with a repositioning precision of 135 nm. This makes possible to either selectively address one atom of a string of atoms by the cavity, or to simultaneously couple two precisely separated atoms to a higher mode of the cavity.

Stefan Nussmann; Markus Hijlkema; Bernhard Weber; Felix Rohde; Gerhard Rempe; Axel Kuhn

2005-06-10T23:59:59.000Z

84

Cavity cooling of a single atom  

E-Print Network (OSTI)

All conventional methods to laser-cool atoms rely on repeated cycles of optical pumping and spontaneous emission of a photon by the atom. Spontaneous emission in a random direction is the dissipative mechanism required to remove entropy from the atom. However, alternative cooling methods have been proposed for a single atom strongly coupled to a high-finesse cavity; the role of spontaneous emission is replaced by the escape of a photon from the cavity. Application of such cooling schemes would improve the performance of atom cavity systems for quantum information processing. Furthermore, as cavity cooling does not rely on spontaneous emission, it can be applied to systems that cannot be laser-cooled by conventional methods; these include molecules (which do not have a closed transition) and collective excitations of Bose condensates, which are destroyed by randomly directed recoil kicks. Here we demonstrate cavity cooling of single rubidium atoms stored in an intracavity dipole trap. The cooling mechanism results in extended storage times and improved localization of atoms. We estimate that the observed cooling rate is at least five times larger than that produced by free-space cooling methods, for comparable excitation of the atom.

P. Maunz; T. Puppe; I. Schuster; N. Syassen; P. W. H. Pinkse; G. Rempe

2004-03-03T23:59:59.000Z

85

Tenth Atomic Physics Program workshop  

Science Conference Proceedings (OSTI)

This report contains short papers and abstracts on the following main topics: Ion-atom collision theory; laser physics; spectroscopy of atoms; spectroscopy of ions; and high velocity collisions.

Not Available

1989-10-01T23:59:59.000Z

86

Nuclear effects in atomic transitions  

E-Print Network (OSTI)

Atomic electrons are sensitive to the properties of the nucleus they are bound to, such as nuclear mass, charge distribution, spin, magnetization distribution, or even excited level scheme. These nuclear parameters are reflected in the atomic transition energies. A very precise determination of atomic spectra may thus reveal information about the nucleus, otherwise hardly accessible via nuclear physics experiments. This work reviews theoretical and experimental aspects of the nuclear effects that can be identified in atomic structure data. An introduction to the theory of isotope shifts and hyperfine splitting of atomic spectra is given, together with an overview of the typical experimental techniques used in high-precision atomic spectroscopy. More exotic effects at the borderline between atomic and nuclear physics, such as parity violation in atomic transitions due to the weak interaction, or nuclear polarization and nuclear excitation by electron capture, are also addressed.

Plffy, Adriana

2011-01-01T23:59:59.000Z

87

Atomic Devices and Instrumentation Group  

Science Conference Proceedings (OSTI)

... 2001 and 2005, demonstrated an atomic clock physics package with ... magnetometers for magnetic anomaly detection, nuclear magnetic resonance ...

2013-08-09T23:59:59.000Z

88

Atom-Based Dimensional Metrology  

Science Conference Proceedings (OSTI)

... Awarded a five year, three phase DARPA contract to conduct collaborative research in atomically precise positioning, patterning and metrology ...

2013-04-19T23:59:59.000Z

89

Moller Polarimetry with Atomic Hydrogen Targets  

DOE Green Energy (OSTI)

A novel proposal of using polarized atomic hydrogen gas, stored in an ultra-cold magnetic trap, as the target for electron beam polarimetry based on Moller scattering is discussed. Such a target of practically 100% polarized electrons could provide a superb systematic accuracy of about 0.5% for beam polarization measurements. The feasibility studies for the CEBAF electron beam have been performed.

Eugene Chudakov; Vladimir Luppov

2003-10-19T23:59:59.000Z

90

Why is hydrogen's atomic number 1?  

NLE Websites -- All DOE Office Websites (Extended Search)

the number of protons in an atom's nucleus. Hydrogen's atomic number is 1 because all hydrogen atoms contain exactly one proton. Author: Steve Gagnon, Science Education Specialist...

91

NIST: Phys. Lab. Brochure; Atomic Physics Div.  

Science Conference Proceedings (OSTI)

... ultra-cold atoms and investigate atom optics for innovative instrumentation. Measure and analyze spectra of highly ionized atoms for fusion energy ...

92

Atomic data for fusion  

DOE Green Energy (OSTI)

This report provides a handbook of recommended cross-section and rate-coefficient data for inelastic collisions between hydrogen, helium and lithium atoms, molecules and ions, and encompasses more than 400 different reactions of primary interest in fusion research. Published experimental and theoretical data have been collected and evaluated, and the recommended data are presented in tabular, graphical and parametrized form. Processes include excitation and spectral line emission, charge exchange, ionization, stripping, dissociation and particle interchange reactions. The range of collision energies is appropriate to applications in fusion-energy research.

Hunter, H.T.; Kirkpatrick, M.I.; Alvarez, I.; Cisneros, C.; Phaneuf, R.A. (eds.) [eds.; Barnett, C.F.

1990-07-01T23:59:59.000Z

93

Cancer in atomic bomb survivors  

SciTech Connect

This book presents information on the following topics: sampling of atomic bomb survivors and method of cancer detection in Hiroshima and Nagasaki; atomic bomb dosimetry for epidemiological studies of survivors in Hiroshima and Nagasaki; tumor and tissue registries in Hiroshima and Nagasaki; the cancer registry in Nagasaki, with atomic bomb survivor data, 1973-1977; cancer mortality; methods for study of delayed health effects of a-bomb radiation; experimental radiation carcinogenesis in rodents; leukemia, multiple myeloma, and malignant lymphoma; cancer of the thyroid and salivary glands; malignant tumors in atomic bomb survivors with special reference to the pathology of stomach and lung cancer; colorectal cancer among atomic bomb survivors; breast cancer in atomic bomb survivors; and ovarian neoplasms in atomic bomb survirors.

Shigematsu, I.; Kagan, A.

1986-01-01T23:59:59.000Z

94

All Optical Formation of an Atomic Bose-Einstein Condensate  

E-Print Network (OSTI)

We have created a Bose-Einstein condensate of 87Rb atoms directly in an optical trap. We employ a quasi-electrostatic dipole force trap formed by two crossed CO_2 laser beams. Loading directly from a sub-doppler laser-cooled cloud of atoms results in initial phase space densities of ~1/200. Evaporatively cooling through the BEC transition is achieved by lowering the power in the trapping beams over ~ 2 s. The resulting condensates are F=1 spinors with 3.5 x 10^4 atoms distributed between the m_F = (-1,0,1) states.

M. D. Barrett; J. A. Sauer; M. S. Chapman

2001-06-04T23:59:59.000Z

95

Questions and Answers - Does gravity affect atoms?  

NLE Websites -- All DOE Office Websites (Extended Search)

and Answers Main Index Next Question (Can you crush atoms?) Can you crush atoms? Does gravity affect atoms? Gravity affects atoms the same way it affects all other matter. Every...

96

Optics and interferometry with atoms and molecules  

E-Print Network (OSTI)

Interference with atomic and molecular matter waves is a rich branch of atomic physics and quantum optics. It started with atom diffraction from crystal surfaces and the separated oscillatory fields technique used in atomic ...

Cronin, Alexander D.

97

Atomic Energy Commission Takes Over Responsibility for all Atomic...  

National Nuclear Security Administration (NNSA)

Takes Over Responsibility for all Atomic Energy Programs | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear...

98

Atomic total energies: Atomic Ref.Data Elec Struc Cal  

Science Conference Proceedings (OSTI)

... These tables contain the atomic total energies and orbital eigenvalues, for the ground electronic configuration of the elements H ... Definition of format ...

99

Atomic total energies: Atomic Ref. Data Elec. Struc. Cal.  

Science Conference Proceedings (OSTI)

... These tables contain the atomic total energies and orbital eigenvalues, for the ground electronic configuration of the elements H ... Definition of format ...

100

Laser Cooling and Cold Atomic Matter  

Science Conference Proceedings (OSTI)

Laser Cooling and Cold Atomic Matter: to advance the understanding and applications of cold atomic matter, including ...

2012-05-30T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

NIST - Atomic Energy Levels and Spectra Bibliographic ...  

Science Conference Proceedings (OSTI)

... in this database are from Bibliography on Atomic Energy Levels and ... references to atomic transition probabilities, line intensities, or broadening. ...

102

Capacitive coupling of atomic systems to mesoscopic conductors  

E-Print Network (OSTI)

We describe a technique that enables a strong, coherent coupling between isolated neutral atoms and mesoscopic conductors. The coupling is achieved by exciting atoms trapped above the surface of a superconducting transmission line into Rydberg states with large electric dipole moments, that induce voltage fluctuations in the transmission line. Using a mechanism analogous to cavity quantum electrodynamics an atomic state can be transferred to a long-lived mode of the fluctuating voltage, atoms separated by millimeters can be entangled, or the quantum state of a solid state device can be mapped onto atomic or photonic states.

Srensen, A S; Childress, L; Lukin, M D; Sorensen, Anders S.; Wal, Caspar H. van der; Childress, Lilian; Lukin, Mikhail D.

2003-01-01T23:59:59.000Z

103

Capacitive coupling of atomic systems to mesoscopic conductors  

E-Print Network (OSTI)

We describe a technique that enables a strong, coherent coupling between isolated neutral atoms and mesoscopic conductors. The coupling is achieved by exciting atoms trapped above the surface of a superconducting transmission line into Rydberg states with large electric dipole moments, that induce voltage fluctuations in the transmission line. Using a mechanism analogous to cavity quantum electrodynamics an atomic state can be transferred to a long-lived mode of the fluctuating voltage, atoms separated by millimeters can be entangled, or the quantum state of a solid state device can be mapped onto atomic or photonic states.

Anders S. Sorensen; Caspar H. van der Wal; Lilian Childress; Mikhail D. Lukin

2003-08-27T23:59:59.000Z

104

ATOMIC ENERGY COMMISSION  

Office of Legacy Management (LM)

' ' ATOMIC ENERGY COMMISSION Frank K. Pittman, Director, bivisioa of Waste &&gement and s- portation, Headquarters j CONTAMItUTED RX-AEC-OWNED OR LEASED FACILITIES' This memorandum responds to your TWX certain information on the above subject. the documentation necessary to answer your available due to the records disposal vailing at the time of release or From records that are available and from disc&ions with most familiar with the transfer operations, &have the current radiological conditibn of transferred property is adequate under present standards. The following tabulations follow the format suggested in your TWX and are grouped to an operations or contract r+ponsibility. A,I Ex-AEC Storage Sites - I r:/ National Stockpile Site '(NSS) and OperatEonal

105

Feedback Cooling of a Single Neutral Atom  

E-Print Network (OSTI)

We demonstrate feedback cooling of the motion of a single rubidium atom trapped in a high-finesse optical resonator to a temperature of about 160 \\mu K. Time-dependent transmission and intensity-correlation measurements prove the reduction of the atomic position uncertainty. The feedback increases the 1/e storage time into the one second regime, 30 times longer than without feedback. Feedback cooling therefore rivals state-of-the-art laser cooling, but with the advantages that it requires less optical access and exhibits less optical pumping.

Markus Koch; Christian Sames; Alexander Kubanek; Matthias Apel; Maximilian Balbach; Alexei Ourjoumtsev; Pepijn W. H. Pinkse; Gerhard Rempe

2010-07-12T23:59:59.000Z

106

Feedback Cooling of a Single Neutral Atom  

E-Print Network (OSTI)

We demonstrate feedback cooling of the motion of a single rubidium atom trapped in a high-finesse optical resonator to a temperature of about 160 \\mu K. Time-dependent transmission and intensity-correlation measurements prove the reduction of the atomic position uncertainty. The feedback increases the 1/e storage time into the one second regime, 30 times longer than without feedback. Feedback cooling therefore rivals state-of-the-art laser cooling, but with the advantages that it requires less optical access and exhibits less optical pumping.

Koch, Markus; Kubanek, Alexander; Apel, Matthias; Balbach, Maximilian; Ourjoumtsev, Alexei; Pinkse, Pepijn W H; Rempe, Gerhard

2010-01-01T23:59:59.000Z

107

NIST Atomic Spectra Bibliographic Databases  

Science Conference Proceedings (OSTI)

... The Atomic Energy Levels Data Center and Data Center on ... Reference Data Program (SRDP) and by NIST's Systems Integration for Manufacturing ...

2010-10-05T23:59:59.000Z

108

Technical Highlights Atomic Physics Division  

Science Conference Proceedings (OSTI)

... Physics Division is to develop and apply atomic physics research methods ... community, and to produce and critically compile physical reference data ...

2013-06-04T23:59:59.000Z

109

Atomic Devices and Instrumentation Group  

Science Conference Proceedings (OSTI)

... ten millionths of a second over the course of one day, and are paving the way for atomic-level timekeeping in portable, battery-operated systems ...

110

NIST: Atomic Spectroscopy Group - Homepage  

Science Conference Proceedings (OSTI)

... The program in atomic spectroscopy at NIST provides accurate reference data on spectral lines and energy levels for a wide variety of important ...

2013-07-31T23:59:59.000Z

111

Energy distribution and cooling of a single atom in an optical tweezer  

E-Print Network (OSTI)

We investigate experimentally the energy distribution of a single rubidium atom trapped in a strongly focused dipole trap under various cooling regimes. Using two different methods to measure the mean energy of the atom, we show that the energy distribution of the radiatively cooled atom is close to thermal. We then demonstrate how to reduce the energy of the single atom, first by adiabatic cooling, and then by truncating the Boltzmann distribution of the single atom. This provides a non-deterministic way to prepare atoms at low microKelvin temperatures, close to the ground state of the trapping potential.

C. Tuchendler; A. M. Lance; A. Browaeys; Y. R. P. Sortais; P. Grangier

2008-05-22T23:59:59.000Z

112

Scanning magnetoresistance microscopy of atom chips  

Science Conference Proceedings (OSTI)

Surface based geometries of microfabricated wires or patterned magnetic films can be used to magnetically trap and manipulate ultracold neutral atoms or Bose-Einstein condensates. We investigate the magnetic properties of such atom chips using a scanning magnetoresistive (MR) microscope with high spatial resolution and high field sensitivity. By comparing MR scans of a permanent magnetic atom chip to field profiles obtained using ultracold atoms, we show that MR sensors are ideally suited to observe small variations of the magnetic field caused by imperfections in the wires or magnetic materials which ultimately lead to fragmentation of ultracold atom clouds. Measurements are also provided for the magnetic field produced by a thin current-carrying wire with small geometric modulations along the edge. Comparisons of our measurements with a full numeric calculation of the current flow in the wire and the subsequent magnetic field show excellent agreement. Our results highlight the use of scanning MR microscopy as a convenient and powerful technique for precisely characterizing the magnetic fields produced near the surface of atom chips.

Volk, M.; Whitlock, S.; Wolff, C. H.; Hall, B. V.; Sidorov, A. I. [ARC Centre of Excellence for Quantum-Atom Optics and Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Hawthorn, Victoria 3122 (Australia)

2008-02-15T23:59:59.000Z

113

Towards a quantum gas microscope for fermionic atoms  

E-Print Network (OSTI)

This thesis reports the achievement of a two-species apparatus for use in an upcoming experiment with fermionic ultracold atomic gases. First, we describe the construction of a laser system capable of cooling and trapping ...

Ramasesh, Vinay (Vinay V.)

2012-01-01T23:59:59.000Z

114

Atomic Energy for Military Purposes  

E-Print Network (OSTI)

Atomic Energy for Military Purposes: The Official Report on the Development of the Atomic Bomb member of the project, to draft a report about its activities. Smyth completed the report in the summer, in a censored version. On August 11, 1945, five days after the Allies dropped the first nuclear bomb on Japan

Landweber, Laura

115

THE DEVELOPMENT OF ATOMIC LAW  

SciTech Connect

Since a uniform federal statute hss not been passed in the German Federal Republic, the development of atomic law has centered around the formation of the Federal Ministry for Atomic Affairs, appeal to the German Commission, and the enactment of temporary laws in several of the states. (J.S.R.)

Fischerhof, H.

1958-08-01T23:59:59.000Z

116

AtomicNuclear Properties  

NLE Websites -- All DOE Office Websites (Extended Search)

HTML_PAGES HTML_PAGES This AtomicNuclearProperties page is under intermittent development. Suggestions and comments are welcome. Please report errors. Chemical elements: For entries in red, a pull-down menu permits selection of the physical state. Cryogenic liquid densties are at the boiling point at 1 atm. 0n 1Ps 1H 2He 3Li 4Be 5B 6C 7N 8O 9F 10Ne 11Na 12Mg 13Al 14Si 15P 16S 17Cl 18Ar 19K 20Ca 21Sc 22Ti 23V 24Cr 25Mn 26Fe 27Co 28Ni 29Cu 30Zn 31Ga 32Ge 33As 34Se 35Br 36Kr 37Rb 38Sr 39Y 40Zr 41Nb 42Mo 43Tc 44Ru 45Rh 46Pd 47Ag 48Cd 49In 50Sn 51Sb 52Te 53I 54Xe 55Cs 56Ba 57La 72Hf 73Ta 74W 75Re 76Os 77Ir 78Pt 79Au 80Hg 81Tl 82Pb 83Bi 84Po 85At 86Rn 87Fr 88Ra 89Ac 104Rf 105Db 106Sg 107Bh 108Hs 109Mt 110Ds 111Rg 112 113 114 115 116 mt 118

117

Atomic, Molecular & Optical Sciences  

NLE Websites -- All DOE Office Websites (Extended Search)

Atomic, Molecular and Optical Sciences Atomic, Molecular and Optical Sciences The goal of the program is to understand the structure and dynamics of atoms and molecules using photons and ions as probes. The current program is focussed on studying inner-shell photo-ionization and photo-excitation of atoms and molecules, molecular orientation effects in slow collisions, slowing and cooling molecules, and X-ray photo-excitation of laser-dressed atoms. The experimental and theoretical efforts are designed to break new ground and to provide basic knowledge that is central to the programmatic goals of the Department of Energy (DOE). Unique LBNL facilities such as the Advanced Light Source (ALS), the ECR ion sources at the 88-inch cyclotron, and the National Energy Research Scientific Computing Center (NERSC) are

118

Spectral Emission of Moving Atom  

E-Print Network (OSTI)

A renewed analysis of the H.E. Ives and G.R. Stilwell's experiment on moving hydrogen canal rays (J. Opt. Soc. Am., 1938, v.28, 215) concludes that the spectral emission of a moving atom exhibits always a redshift which informs not the direction of the atom's motion. The conclusion is also evident from a simple energy relation: atomic spectral radiation is emitted as an orbiting electron consumes a portion of its internal energy on transiting to a lower-energy state which however has in a moving atom an additional energy gain; this results in a redshift in the emission frequency. Based on auxiliary experimental information and a scheme for de Broglie particle formation, we give a vigorous elucidation of the mechanism for deceleration radiation of atomic electron; the corresponding prediction of the redshift is in complete agreement with the Ives and Stilwell's experimental formula.

J. X. Zheng-Johansson

2006-06-17T23:59:59.000Z

119

Moller Polarimetry with Atomic Hydrogen Targets  

Science Conference Proceedings (OSTI)

A proposal to use polarized atomic hydrogen gas as the target for electron beam polarimetry based on the Moller scattering is described. Such a gas, stored in an ultra-cold magnetic trap, would provide a target of practically 100\\% polarized electrons. It is conceivable to reach a $\\sim$0.3\\% systematic accuracy of the beam polarimetry with such a target. Feasibility studies for the CEBAF electron beam have been performed.

Eugene Chudakov

2012-06-01T23:59:59.000Z

120

Anticipating the atom: popular perceptions of atomic power before Hiroshima  

E-Print Network (OSTI)

Before Hiroshima made the Bomb an object of popular concern, possible implications and applications of atomic physics had been discussed in the public forum. The new science of X-rays and radium promised the possibilities of unlimited energy and the transmutation of elements in the two decades leading up to World War 1. During the twenties, as scientific method struggled to keep pace with atomic theory, discussion centered on the feasibility of atomic disintegration as an energy source and the many uses of radium. The 1927 case of the New Jersey Radium Dial Painters, who sued their employers for compensation after contracting radium poisoning, revealed a dark side to the new science, that, along with the development of artificial radioactive isotopes by the Jollot-Curies in Paris, and, in Italy, Enrico Fenni's neutron bombardment experiments, sobered attitudes toward the ever-increasing probability of atomic power. When Otto Hahn finally split the atom in 1938, it opened the way to the practical industrial use of atomic fission, and stimulated a flurry of newspaper and magazine articles before World War 11 brought about censorship. Popular entertainment through 1945 reflects the extent to which atomic power had entered the public awareness. Atomic themes and motifs appeared in English language fiction as early as 1895, as did discussions of the social implications of the new science. Such popular culture imagery, including motion pictures and comic book superheroes, that presented the atom to mass audiences provide insight into the popular perceptions at the time, and to the shaping of attitudes toward the Bomb after Hiroshima.

d'Emal, Jacques-Andre Christian

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Manhattan Project: Adventures Inside the Atom  

Office of Scientific and Technical Information (OSTI)

ADVENTURES INSIDE THE ATOM ADVENTURES INSIDE THE ATOM General Electric, National Archives (1948) Resources > Library Below is Adventures Inside the Atom, a comic book history of nuclear energy that was produced in 1948 by the General Electric Company. Scroll down to view the full-size images of each page. This publication was produced at the request of the the Assistant Manager for Public Education, Oak Ridge Operations Office, Atomic Energy Commission. It is reproduced here via the National Archives. Adventures Inside the Atom, p. 1 Adventures Inside the Atom, p. 2 Adventures Inside the Atom, p. 3 Adventures Inside the Atom, p. 4 Adventures Inside the Atom, p. 5 Adventures Inside the Atom, p. 6 Adventures Inside the Atom, p. 7 Adventures Inside the Atom, p. 8 Adventures Inside the Atom, p. 9

122

In-situ control system for atomization  

DOE Patents (OSTI)

Melt atomizing apparatus comprising a melt supply orifice for supplying the melt for atomization and gas supply orifices proximate the melt supply orifice for supplying atomizing gas to atomize the melt as an atomization spray is disclosed. The apparatus includes a sensor, such as an optical and/or audio sensor, for providing atomization spray data, and a control unit responsive to the sensed atomization spray data for controlling at least one of the atomizing gas pressure and an actuator to adjust the relative position of the gas supply orifice and melt supply in a manner to achieve a desired atomization spray. 3 figs.

Anderson, I.E.; Figliola, R.S.; Terpstra, R.L.

1995-06-13T23:59:59.000Z

123

In-situ control system for atomization  

DOE Patents (OSTI)

Melt atomizing apparatus comprising a melt supply orifice for supplying the melt for atomization and gas supply orifices proximate the melt supply orifice for supplying atomizing gas to atomize the melt as an atomization spray. The apparatus includes a sensor, such as an optical and/or audio sensor, for providing atomization spray data, and a control unit responsive to the sensed atomization spray data for controlling at least one of the atomizing gas pressure and an actuator to adjust the relative position of the gas supply orifice and melt supply in a manner to achieve a desired atomization spray.

Anderson, Iver E. (Ames, IA); Figliola, Richard S. (Central, SC); Terpstra, Robert L. (Ames, IA)

1995-06-13T23:59:59.000Z

124

Supersonic coal water slurry fuel atomizer  

DOE Patents (OSTI)

A supersonic coal water slurry atomizer utilizing supersonic gas velocities to atomize coal water slurry is provided wherein atomization occurs externally of the atomizer. The atomizer has a central tube defining a coal water slurry passageway surrounded by an annular sleeve defining an annular passageway for gas. A converging/diverging section is provided for accelerating gas in the annular passageway to supersonic velocities.

Becker, Frederick E. (Reading, MA); Smolensky, Leo A. (Concord, MA); Balsavich, John (Foxborough, MA)

1991-01-01T23:59:59.000Z

125

Questions and Answers - Does an atom smasher really smash atoms?  

NLE Websites -- All DOE Office Websites (Extended Search)

is an accelerator? is an accelerator? Previous Question (What is an accelerator?) Questions and Answers Main Index Next Question (Where and how do you get your electrons for your accelerator?) Where and how do you get yourelectrons for your accelerator? Does an atom smasher really smash atoms? Well, yes, they do, but we now prefer to call them by their less aggression-centered name, "particle harmony disrupters." Of course some atom smashers do much more smashing than others. We use electrons in our accelerator to study the nucleus of an atom. Remember that electrons are negative, as are the electrons surrounding the target. Since like charged particles repel each other, our particles have to have enough energy to blast through that electron cloud to get to the nucleus. The electrons then

126

Remote generation of entanglement for individual atoms via optical fibers  

E-Print Network (OSTI)

The generation of atomic entanglement is discussed in a system that atoms are trapped in separate cavities which are connected via optical fibers. Two distant atoms can be projected to Bell-state by synchronized turning off the local laser fields and then performing a single quantum measurement by a distant controller. The distinct advantage of this scheme is that it works in a regime that $\\Delta\\approx\\kappa\\gg g$, which makes the scheme insensitive to cavity strong leakage. Moreover, the fidelity is not affected by atomic spontaneous emission.

Y. Q. Guo; H. Y. Zhong; Y. H. Zhang; H. S. Song

2008-05-29T23:59:59.000Z

127

Optimized U-MOT for experiments with ultracold atoms near surfaces  

E-Print Network (OSTI)

We present an integrated wire-based magnetooptical trap for the simplified trapping and cooling of large numbers of neutral atoms near material surfaces. With a modified U-shaped current-carrying Cu structure we collect $>3\\times 10^8$ $^{87}$Rb atoms in a mirror MOT without using quadrupole coils. These atoms are subsequently loaded to a Z-wire trap where they are evaporatively cooled to a Bose-Einstein condensate close to the surface.

S. Wildermuth; P. Krger; C. Becker; M. Brajdic; S. Haupt; A. Kasper; R. Folman; J. Schmiedmayer

2003-11-20T23:59:59.000Z

128

UNITED STATES ATOMIC ENERGY COMMISSION  

Office of Legacy Management (LM)

producing uranium for the Mo"hz,t,a, Projec, can best be qwtcd Irom the Smyth official report - Atomic Energy - . ' .: CCL, + NaCl - ."-l Figure 6. apparatus used in electrcdytic...

129

Single artificial-atom lasing  

E-Print Network (OSTI)

Solid-state superconducting circuits are versatile systems in which quantum states can be engineered and controlled. Recent progress in this area has opened up exciting possibilities for exploring fundamental physics as well as applications in quantum information technology; in a series of experiments it was shown that such circuits can be exploited to generate quantum optical phenomena, by designing superconducting elements as artificial atoms that are coupled coherently to the photon field of a resonator. Here we demonstrate a lasing effect with a single artificial atom - a Josephson-junction charge qubit - embedded in a superconducting resonator. We make use of one of the properties of solid-state artificial atoms, namely that they are strongly and controllably coupled to the resonator modes. The device is essentially different from existing lasers and masers; one and the same artificial atom excited by current injection produces many photons.

O. Astafiev; K. Inomata; A. O. Niskanen; T. Yamamoto; Yu. A. Pashkin; Y. Nakamura; J. S. Tsai

2007-10-04T23:59:59.000Z

130

u. S. Atomic Energy Commission  

Office of Legacy Management (LM)

October 31, 1949 Manager of Operations u. S. Atomic Energy Commission R. 0. Box 30, Ansonia Station New York ES, N. Y. MATERIALS 5+k& hJf Reference: SK:BL Attention: Mr. R. J....

131

Exotic atoms and leptonic conservations  

DOE Green Energy (OSTI)

The major 1989 efforts have been on two aspects of experiments at TRIUMF. One effort was production of muonic hydrogen and muonic deuterium into a vacuum. We study rates relevant to muonic catalyzed fusion, and if there are found an adequate number of muons in the 2s state then we plan to measure precision energies. The second effort was to develop plans for kaonic atoms at the kaon factory. We also completed analyses from the experiments with pionic atoms at LAMPF.

Kunselman, R.

1990-01-01T23:59:59.000Z

132

Transition from LEDCOP to ATOMIC  

SciTech Connect

This paper discusses the development of the ATOMIC code, a new low to mid Z opacity code, which will replace the current Los Alamos low Z opacity code LEDCOP. The ATOMIC code is based on the FINE code, long used by the Los Alamos group for spectral comparisons in local thermodynamic equilibrium (LTE) and for non-LTE calculations, both utilizing the extensive databases from the atomic physics suite of codes based on the work of R.D. Cowan. Many of the plasma physics packages in LEDCOP, such as line broadening and free-free absorption, are being transferred to the new ATOMIC code. A new equation of state (EOS) model is being developed to allow higher density calculations than were possible with either the FINE or LEDCOP codes. Extensive modernization for both ATOMIC and the atomic physics code suites, including conversion to Fortran 90 and parallelization, are underway to speed up the calculations and to allow the use of expanded databases for both the LTE opacity tables and the non-LTE calculations. Future plans for the code will be outlined, including considerations for new generation opacity tables.

Magee, N. H. (Norman H.); Abdallah, J. (Joseph); Colgan, J. (James); Hakel, P. (Peter); Kilcrease, D. P. (David P.); Mazevet, S. (Stephane); Sherrill, M. E. (Manolo E.); Fontes, C. J. (Christopher J.); Zhang, H. (Honglin)

2004-01-01T23:59:59.000Z

133

Atomic Physics Division 1999 - Future Directions  

Science Conference Proceedings (OSTI)

... lying Rydberg states constitute a "frozen" Rydberg gas. ... of atom interactions in cold atomic gases and Bose ... or optical fields and tight confinement of ...

134

Cavity Quantum Electrodynamics with Ultracold Atoms.  

E-Print Network (OSTI)

??Die vorliegende Arbeit befasst sich mit der Wechselwirkung ultrakalter Atome mit der Mode eines optischen Resonators hoher Gu?te. Die Atome sind dabei in einem periodischen (more)

Habibian, Hessam

2013-01-01T23:59:59.000Z

135

Observation of relativistic antihydrogen atoms  

DOE Green Energy (OSTI)

An observation of relativistic antihydrogen atoms is reported in this dissertation. Experiment 862 at Fermi National Accelerator Laboratory observed antihydrogen atoms produced by the interaction of a circulating beam of high momentum (3 < p < 9 GeV/c) antiprotons and a jet of molecular hydrogen gas. Since the neutral antihydrogen does not bend in the antiproton source magnets, the detectors could be located far from the interaction point on a beamline tangent to the storage ring. The detection of the antihydrogen is accomplished by ionizing the atoms far from the interaction point. The positron is deflected by a magnetic spectrometer and detected, as are the back to back photons resulting from its annihilation. The antiproton travels a distance long enough for its momentum and time of flight to be measured accurately. A statistically significant sample of 101 antihydrogen atoms has been observed. A measurement of the cross section for {bar H}{sup 0} production is outlined within. The cross section corresponds to the process where a high momentum antiproton causes e{sup +} e{sup -} pair creation near a nucleus with the e{sup +} being captured by the antiproton. Antihydrogen is the first atom made exclusively of antimatter to be detected. The observation experiment's results are the first step towards an antihydrogen spectroscopy experiment which would measure the n = 2 Lamb shift and fine structure.

Blanford, Glenn DelFosse

1998-01-01T23:59:59.000Z

136

SCHROEDINGER'S CAT IN AN ATOMIC CAGE  

Science Conference Proceedings (OSTI)

... gov SCHROEDINGER'S CAT IN AN ATOMIC CAGE. They ... conditions. Schroedinger cat states are extremely fragile. Any ...

137

NIST: Atomic Spectros. - Spectral Continuum Radiation  

Science Conference Proceedings (OSTI)

Atomic Spectroscopy: home page. 21. Spectral Continuum Radiation. Hydrogenic Species. Precise quantum-mechanical ...

138

Cancer in atomic bomb survivors  

SciTech Connect

Radiation carcinogenesis was first noted in studies of individuals with occupational or therapeutic exposure to radiation. Data from long-term follow-up studies of atomic bomb survivors in Hiroshima and Nagasaki have greatly enhanced our knowledge of radiation carcinogenesis. This book presents current results obtained from epidemiological studies and pathological studies on cancer among atomic bomb survivors. It includes a description of the dosimetry system which is currently being revised. Although many of the details about radiation carcinogenesis remain unknown or uncertain, it is clear that the incidence of radiation-induced cancer among atomic bomb survivors continues unabated 40 years after exposure. Recent increases in occupational and environmental exposure to radiation together with the need for a thorough review of radiation protection standards have led to increased recognition of the importance of research on radiation carcinogenesis and risk assessment.

Shigematsu, I.; Kagan, A.

1986-01-01T23:59:59.000Z

139

Hot atom chemistry and radiopharmaceuticals  

Science Conference Proceedings (OSTI)

The chemical products made in a cyclotron target are a combined result of the chemical effects of the nuclear transformation that made the radioactive atom and the bulk radiolysis in the target. This review uses some well-known examples to understand how hot atom chemistry explains the primary products from a nuclear reaction and then how radiation chemistry is exploited to set up the optimal product for radiosynthesis. It also addresses the chemical effects of nuclear decay. There are important principles that are common to hot atom chemistry and radiopharmaceutical chemistry. Both emphasize short-lived radionuclides and manipulation of high specific activity nuclides. Furthermore, they both rely on radiochromatographic separation for identification of no-carrieradded products.

Krohn, Kenneth A.; Moerlein, Stephen M.; Link, Jeanne M.; Welch, Michael J. [University of Washington, Department of Radiology, Molecular Imaging Center, 1959 NE Pacific St., Box 356004, Seattle, WA 98195-6004 (United States); Washington University, Department of Radiology, Division of Radiological Sciences, 510 South Kingshighway, St. Louis, MO 63110 (United States); University of Washington, Department of Radiology, Molecular Imaging Center, 1959 NE Pacific St., Box 356004, Seattle, WA 98195-6004 (United States); Washington University, Department of Radiology, Division of Radiological Sciences, 510 South Kingshighway, St. Louis, MO 63110 (United States)

2012-12-19T23:59:59.000Z

140

Degeneracy Breaking of Hydrogen Atom  

E-Print Network (OSTI)

The three dimensional rotation group, SO(3), is a symmetry group of the normal hydrogen atom. Each reducible representation of this group can be associated with a degenerate energy level. If this atom is placed in an external magnetic field, the interaction between the orbital magnetic moment with this field will lead to a symmetry breaking where the symmetry group of the atom is a new group distinct from the SO(3) group. This phenomenon describes the normal Zeeman effect, where a degenerate energy level splits into several new energy levels. It is explicitly shown that each of the new energy levels can be associated with an irreducible representation of the new symmetry group.

Agung Trisetyarso; Pantur Silaban

2008-12-22T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Atom-molecule conversion with particle losses  

E-Print Network (OSTI)

Based on the mean-field approximation and the phase space analysis, we study the dynamics of an atom-molecule conversion system subject to particle loss. Starting from the many-body dynamics described by a master equation, an effective nonlinear Schr\\"odinger equation is introduced. The classical phase space is then specified and classified by fixed points. The boundary, which separate different dynamical regimes have been calculated and discussed. The effect of particle loss on the conversion efficiency and the self-trapping is explored.

B. Cui; L. C. Wang; X. X. Yi

2011-03-01T23:59:59.000Z

142

Stationary light in cold atomic gases  

E-Print Network (OSTI)

We discuss stationary light created by a pair of counter-propagating control fields in Lambda-type atomic gases with electromagnetically induced transparency for the case of negligible Doppler broadening. In this case the secular approximation used in the discussion of stationary light in hot vapors is no longer valid. We discuss the quality of the effective light-trapping system and show that in contrast to previous claims it is finite even for vanishing ground-state dephasing. The dynamics of the photon loss is in general non exponential and can be faster or slower than in hot gases.

Gor Nikoghosyan; Michael Fleischhauer

2009-03-10T23:59:59.000Z

143

Supercomputers and atomic physics data  

SciTech Connect

The advent of the supercomputer has dramatically increased the possibilities for generating and using massive amounts of detailed fine structure atomic physics data. Size, speed, and software have made calculations which were impossible just a few years ago into a reality. Further technological advances make future possibilities seem endless. The cornerstone atomic structure codes of R.D. Cowan have been adapted into a single code CATS for use on Los Alamos supercomputers. We provide a brief overview of the problem; and report a sample CATS calculation using configuration interaction to calculate collision and oscillator strengths for over 300,000 transitions in neutral nitrogen. We also discuss future supercomputer needs. 2 refs.

Abdallah, J. Jr.; Clark, R.E.H.

1988-01-01T23:59:59.000Z

144

Supersonic coal water slurry fuel atomizer  

DOE Patents (OSTI)

A supersonic coal water slurry atomizer utilizing supersonic gas velocities to atomize coal water slurry is provided wherein atomization occurs externally of the atomizer. The atomizer has a central tube defining a coal water slurry passageway surrounded by an annular sleeve defining an annular passageway for gas. A converging/diverging section is provided for accelerating gas in the annular passageway to supersonic velocities. 3 figs.

Becker, F.E.; Smolensky, L.S.; Balsavich, J.

1989-11-01T23:59:59.000Z

145

Coherent manipulation of atomic qubits in optical micropotentials  

E-Print Network (OSTI)

We experimentally demonstrate the coherent manipulation of atomic states in far-detuned dipole traps and registers of dipole traps based on two-dimensional arrays of microlenses. By applying Rabi, Ramsey, and spin-echo techniques, we systematically investigate the dephasing mechanisms and determine the coherence time. Simultaneous Ramsey measurements in up to 16 dipole traps are performed and proves the scalability of our approach. This represents an important step in the application of scalable registers of atomic qubits for quantum information processing. In addition, this system can serve as the basis for novel atomic clocks making use of the parallel operation of a large number of individual clocks each remaining separately addressable.

A. Lengwenus; J. Kruse; M. Volk; W. Ertmer; G. Birkl

2007-02-09T23:59:59.000Z

146

Lesson 6- Atoms to Electricity  

Energy.gov (U.S. Department of Energy (DOE))

Most power plants make electricity by boiling water to make steam that turns a turbine. A nuclear power plant works this way, too. At a nuclear power plant, splitting atoms produce the heat to boil the water. This lesson covers inside the reactor, fission control and electricity generation.

147

Dynamical polarization in pionic atoms  

SciTech Connect

Dynamical nuclear polarization occurs in pionic atoms when a nuclear excitation of appropriate multipolarity is nearly degenerate with de-excitation of a pion atomic level. This phenomenon has been studied in several nuclei, one goal being to test the pion optical potential for pion atomic states normally ''hidden'' because of pion absorption. We find that, in addition to Coulomb mixing of the atomic and nuclear levels, strong interaction mixing and nuclear excitations above the lowest collective quadrupole mode are important for understanding the experimental results. All cases except /sup 110/Pd can then be understood. For /sup 110/Pd, additional nuclear structure information is needed to determine whether or not the conventional pion optical potential will suffice again. We discuss the sensitivity of dynamical polarization measurements to the parameters of the optical potential and to various aspects of nuclear structure. In particular, we find that pionic /sup 150/Sm provides a test of the interacting boson model and that the difference in neutron and proton radii predicted by Hartree-Fock calculations affects the mixing appreciably.

Dubach, J.F.; Moniz, E.J.; Nixon, G.D.

1979-08-01T23:59:59.000Z

148

Quantum kinetic theory model of a continuous atom laser  

E-Print Network (OSTI)

We investigate the feasible limits for realising a continuously evaporated atom laser with high-temperature sources. A plausible scheme for realising a truly continuous atom laser is to outcouple atoms from a partially condensed Bose gas, whilst continuously reloading the system with non-condensed thermal atoms and performing evaporative cooling. Here we use quantum kinetic theory to model this system and estimate feasible limits for the operation of such a scheme. For sufficiently high temperatures, the figure of merit for the source is shown to be the phase-space flux. The dominant process limiting the usage of sources with low phase-space flux is the three-body loss of the condensed gas. We conclude that certain double-magneto-optical trap (MOT) sources may produce substantial mean condensate numbers through continuous evaporation, and provide an atom laser source with a narrow linewidth and reasonable flux.

G. R. Dennis; Matthew J. Davis; J. J. Hope

2010-11-24T23:59:59.000Z

149

Atomic hydrogen adsorption on lithium-doped graphite surfaces  

SciTech Connect

The effects of lithium doping of pristine and defective graphite surfaces on hydrogen adsorption are studied by the first-principles Plane-Wave Density Functional Theory. The surface defects are simulated by a single atomic vacancy. The DFT calculation is corrected for long-range effects through semi-empirical London terms for each constituent of the system. The lithium doping of the graphite surfaces notably reinforces hydrogen atom binding. Qualitative comparison with experimental results is given using the lithium 1s energy level shifts induced by the atomic vacancy and/or hydrogen trapping.

Allouche, Alain [CNRS/Univ. de Provence (France); Krstic, Predrag S [ORNL

2012-01-01T23:59:59.000Z

150

Transverse laser cooling of a thermal atomic beam of dysprosium  

E-Print Network (OSTI)

A thermal atomic beam of dysprosium (Dy) atoms is cooled using the $4f^{10}6s^2(J=8) \\to 4f^{10}6s6p (J=9)$ transition at 421 nm. The cooling is done via a standing light wave orthogonal to the atomic beam. Efficient transverse cooling to a temperature of $\\sim$ 22 mK is demonstrated for all stable isotopes of dysprosium. Branching ratios to metastable states are demonstrated to be $cooling is proposed as well as a method for direct identification of possible trap states.

Leefer, N; Gerber-Siff, B; Sharma, Arijit; Torgerson, J R; Budker, D

2009-01-01T23:59:59.000Z

151

Laser Probing of Neutron-Rich Nuclei in Light Atoms  

E-Print Network (OSTI)

The neutron-rich 6He and 8He isotopes exhibit an exotic nuclear structure that consists of a tightly bound 4He-like core with additional neutrons orbiting at a relatively large distance, forming a halo. Recent experimental efforts have succeeded in laser trapping and cooling these short-lived, rare helium atoms, and have measured the atomic isotope shifts along the 4He-6He-8He chain by performing laser spectroscopy on individual trapped atoms. Meanwhile, the few-electron atomic structure theory, including relativistic and QED corrections, has reached a comparable degree of accuracy in the calculation of the isotope shifts. In parallel efforts, also by measuring atomic isotope shifts, the nuclear charge radii of lithium and beryllium isotopes have been studied. The techniques employed were resonance ionization spectroscopy on neutral, thermal lithium atoms and collinear laser spectroscopy on beryllium ions. Combining advances in both atomic theory and laser spectroscopy, the charge radii of these light halo nuclei have now been determined for the first time independent of nuclear structure models. The results are compared with the values predicted by a number of nuclear structure calculations, and are used to guide our understanding of the nuclear forces in the extremely neutron-rich environment.

Z. -T. Lu; P. Mueller; G. W. F. Drake; W. Noertershaeuser; Steven C. Pieper; Z. -C. Yan

2013-07-10T23:59:59.000Z

152

Magneto-Optical Cooling of Atoms  

E-Print Network (OSTI)

We propose an alternative method to laser cooling. Our approach utilizes the extreme brightness of a supersonic atomic beam, and the adiabatic atomic coilgun to slow atoms in the beam or to bring them to rest. We show how internal-state optical pumping and stimulated optical transitions, combined with magnetic forces can be used to cool the translational motion of atoms. This approach does not rely on momentum transfer from photons to atoms, as in laser cooling. We predict that our method can surpass laser cooling in terms of flux of ultra-cold atoms and phase-space density, with lower required laser power and reduced complexity.

Raizen, Mark G; Rochester, Simon; Narevicius, Julia; Narevicius, Edvardas

2013-01-01T23:59:59.000Z

153

Atomic physics and non-equilibrium plasmas  

DOE Green Energy (OSTI)

Three lectures comprise the report. The lecture, Atomic Structure, is primarily theoretical and covers four topics: (1) Non-relativistic one-electron atom, (2) Relativistic one-electron atom, (3) Non-relativistic many-electron atom, and (4) Relativistic many-electron atom. The lecture, Radiative and Collisional Transitions, considers the problem of transitions between atomic states caused by interactions with radiation or other particles. The lecture, Ionization Balance: Spectral Line Shapes, discusses collisional and radiative transitions when ionization and recombination processes are included. 24 figs., 11 tabs.

Weisheit, J.C.

1986-04-25T23:59:59.000Z

154

UNITED STATES ATOMIC ENERGY COMMISSION  

Office of Legacy Management (LM)

I(S.0 -01: I(S.0 -01: SPECIAL NUCLEAR MATERIAL LlCEWSE Pursuant to the Atomic Energy Act of 1954 and Title 10, Code of Federal Regulations, Chapter 1, Part 70, "Special Nuclear Material Regulations," o. license is hereby issued authorizing the licensee to receive and possess the special nuclear material designated below; to use such special nuclear material for the purpose(s) and at the place(s) designated below; and to transfer such material to persons' authorized to receive it in accordance with the regulations in said Port. This license shall be deemed to contain the conditions specified in Section 70.32(a) of said regulations, and is subject to all applicable rules, regtdations, and orders of the Atomic Energy Commission now or hereafter in

155

Atomic vapor laser isotope separation  

SciTech Connect

Atomic vapor laser isotope separation (AVLIS) is a general and powerful technique. A major present application to the enrichment of uranium for light-water power reactor fuel has been under development for over 10 years. In June 1985 the Department of Energy announced the selection of AVLIS as the technology to meet the nation's future need for the internationally competitive production of uranium separative work. The economic basis for this decision is considered, with an indicated of the constraints placed on the process figures of merit and the process laser system. We then trace an atom through a generic AVLIS separator and give examples of the physical steps encountered, the models used to describe the process physics, the fundamental parameters involved, and the role of diagnostic laser measurements.

Stern, R.C.; Paisner, J.A.

1985-11-08T23:59:59.000Z

156

The Future of Atomic Energy  

DOE R&D Accomplishments (OSTI)

There is definitely a technical possibility that atomic power may gradually develop into one of the principal sources of useful power. If this expectation will prove correct, great advantages can be expected to come from the fact that the weight of the fuel is almost negligible. This feature may be particularly valuable for making power available to regions of difficult access and far from deposits of coal. It also may prove a great asset in mobile power units for example in a power plant for ship propulsion. On the negative side there are some technical limitations to be applicability of atomic power of which perhaps the most serious is the impossibility of constructing light power units; also there will be some peculiar difficulties in operating atomic plants, as for example the necessity of handling highly radioactive substances which will necessitate, at least for some considerable period, the use of specially skilled personnel for the operation. But the chief obstacle in the way of developing atomic power will be the difficulty of organizing a large scale industrial development in an internationally safe way. This presents actually problems much more difficult to solve than any of the technical developments that are necessary, It will require an unusual amount of statesmanship to balance properly the necessity of allaying the international suspicion that arises from withholding technical secrets against the obvious danger of dumping the details of the procedures for an extremely dangerous new method of warfare on a world that may not yet be prepared to renounce war. Furthermore, the proper balance should be found in the relatively short time that will elapse before the 'secrets' will naturally become open knowledge by rediscovery on part of the scientists and engineers of other countries.

Fermi, E.

1946-05-27T23:59:59.000Z

157

STAR FORMATION IN ATOMIC GAS  

SciTech Connect

Observations of nearby galaxies have firmly established, over a broad range of galactic environments and metallicities, that star formation occurs exclusively in the molecular phase of the interstellar medium (ISM). Theoretical models show that this association results from the correlation between chemical phase, shielding, and temperature. Interstellar gas converts from atomic to molecular only in regions that are well shielded from interstellar ultraviolet (UV) photons, and since UV photons are also the dominant source of interstellar heating, only in these shielded regions does the gas become cold enough to be subject to Jeans instability. However, while the equilibrium temperature and chemical state of interstellar gas are well correlated, the timescale required to reach chemical equilibrium is much longer than that required to reach thermal equilibrium, and both timescales are metallicity-dependent. Here I show that the difference in timescales implies that, at metallicities below a few percent of the solar value, well shielded gas will reach low temperatures and proceed to star formation before the bulk of it is able to convert from atomic to molecular. As a result, at extremely low metallicities, star formation will occur in a cold atomic phase of the ISM rather than a molecular phase. I calculate the observable consequences of this result for star formation in low-metallicity galaxies, and I discuss how some current numerical models for H{sub 2}-regulated star formation may need to be modified.

Krumholz, Mark R., E-mail: krumholz@ucolick.org [Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)

2012-11-01T23:59:59.000Z

158

Role of atomic collisions in fusion  

SciTech Connect

Atomic physics issues have played a large role in controlled fusion research. A general discussion of the present role of atomic processes in both magnetic and inertial controlled fusion work is presented.

Post, D.E.

1982-04-01T23:59:59.000Z

159

Atomic vapor laser isotope separation process  

DOE Patents (OSTI)

A laser spectroscopy system is utilized in an atomic vapor laser isotope separation process. The system determines spectral components of an atomic vapor utilizing a laser heterodyne technique. 23 figs.

Wyeth, R.W.; Paisner, J.A.; Story, T.

1990-08-21T23:59:59.000Z

160

NIST Atomic Form Factors: Summary of uncertainties  

Science Conference Proceedings (OSTI)

... element. This "H92 - 3/5CL" value is 1.09 e/atom for uranium or 0.002 e/atom for Z = 6 (ie, 40 % of the dipole correction). ...

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Towards a high-precision atomic gyroscope  

E-Print Network (OSTI)

In this thesis, I report on the design and construction of the Rubidium Atomic Gyroscope Experiment (RAGE) at Draper Lab.

Van Camp, Mackenzie A. (Mackenzie Anne)

2013-01-01T23:59:59.000Z

162

Argonne Chemical Sciences & Engineering - Institute for Atom...  

NLE Websites -- All DOE Office Websites (Extended Search)

Catalysis & Energy Conversion Electrochemical Energy Storage Nuclear & Environmental Processes National Security Institute for Atom-Efficient Chemical Transformations Center for...

163

NIST: Atomic Spectroscopy Group - Past News  

Science Conference Proceedings (OSTI)

... of Atomic, Molecular, and Optical Physics of the American Physical Society (DAMOP) in ... and Determination of Relative Nuclear Charge Radius.". ...

2013-06-06T23:59:59.000Z

164

Atomic Scale Deformation Mechanisms of Amorphous Polyethylene ...  

Science Conference Proceedings (OSTI)

Atomic Scale Deformation Mechanisms of Amorphous Polyethylene under Tensile Loading Atomistic Predictions of Age Hardening in Al-Cu Alloys.

165

NIST: Atomic Spectroscopy Group - John Curry  

Science Conference Proceedings (OSTI)

... chemical equilibrium and deviations from thermodynamic equilibrium. I am also interested in the acquisition and compilation of basic atomic data. ...

2011-02-09T23:59:59.000Z

166

NIST Atomic Physics Division 2000 - Technical Highlights  

Science Conference Proceedings (OSTI)

... Astrophysical Quantities," a handbook widely used ... and single-atom chemistry, where controlled ... understanding of fundamental processes occurring ...

167

Collisionally Induced Atomic Clock Shifts and Correlations  

E-Print Network (OSTI)

We develop a formalism to incorporate exchange symmetry considerations into the calculation of collisional frequency shifts and blackbody radiation effects for atomic clock transitions using a density matrix formalism. The formalism is developed for both fermionic and bosonic atomic clocks. Results for a finite temperature ${}^{87}$Sr ${}^1S_0$ ($F = 9/2$) atomic clock in a magic wavelength optical lattice are presented.

Y. B. Band; I. Osherov

2010-11-15T23:59:59.000Z

168

Low temperature dynamics of netral atoms for quantum logic  

Science Conference Proceedings (OSTI)

We study from the point of view of quantum logic the properties of the collective oscillations of two Rydberg atoms in two harmonic traps. The difference in the frequency of two normal modes of motion expands with the difference in the mass of the two ... Keywords: Rydberg state, normal mode, quantum state transfer

Fang-Yu Hong; Yang Xiang; Z. Y. Zhu; W. H. Tang

2011-11-01T23:59:59.000Z

169

Van der Waals enhancement of optical atom potentials via resonant coupling to surface polaritons  

E-Print Network (OSTI)

Contemporary experiments in cavity quantum electrodynamics (cavity QED) with gas-phase neutral atoms rely increasingly on laser cooling and optical, magneto-optical or magnetostatic trapping methods to provide atomic localization with sub-micron uncertainty. Difficult to achieve in free space, this goal is further frustrated by atom-surface interactions if the desired atomic placement approaches within several hundred nanometers of a solid surface, as can be the case in setups incorporating monolithic dielectric optical resonators such as microspheres, microtoroids, microdisks or photonic crystal defect cavities. Typically in such scenarios, the smallest atom-surface separation at which the van der Waals interaction can be neglected is taken to be the optimal localization point for associated trapping schemes, but this sort of conservative strategy generally compromises the achievable cavity QED coupling strength. Here we suggest a new approach to the design of optical dipole traps for atom confinement near s...

Kerckhoff, Joseph

2009-01-01T23:59:59.000Z

170

General Atomics (GA) Fusion News: A New Spin on Understanding...  

NLE Websites -- All DOE Office Websites (Extended Search)

General Atomics (GA) Fusion News: A New Spin on Understanding Plasma Confinement American Fusion News Category: General Atomics (GA) Link: General Atomics (GA) Fusion News: A New...

171

Pages that link to "Atomic City, Idaho" | Open Energy Information  

Open Energy Info (EERE)

Share this page on Facebook icon Twitter icon Pages that link to "Atomic City, Idaho" Atomic City, Idaho Jump to: navigation, search What links here Page: Atomic City,...

172

Chapter 2 Suggested Problems: Final Answer Key Atomic mass: mass of an individual atom  

E-Print Network (OSTI)

Chapter 2 Suggested Problems: Final Answer Key 2.1 Atomic mass: mass of an individual atom Atomic;Chapter 3 Suggested Problems: Final Answer Key 3.1 Atomic Structure: relates the # of protons and neutrons of intercepts 2 2 1 Reduction not necessary Enclosure (221) #12;Chapter 12 Suggested Problems: Final Answer Key

Grunlan, Melissa A.

173

CERTIFICATION DOCKET WESTINGHOUSE ATOMIC POWER DEVELOPMENT PLANT  

Office of Legacy Management (LM)

WESTINGHOUSE ATOMIC POWER DEVELOPMENT PLANT WESTINGHOUSE ATOMIC POWER DEVELOPMENT PLANT EAST PITTSBURGH PLANT FOREST HILLS PITTSBURGH, PENNSYLVANIA Department of Energy Office of Nuclear Energy Office of Terminal Waste Disposal and Remedial Action Division of Remedial Action Projects ..-.. --__- _".-.-l--_--l -_._ _- --- ~~~. . ..~ CONTENTS Page - - I NTRODUCTI ON 1 Purpose 1 Docket Contents 1 Exhibit I: Summary of Activities at Westinghouse Atomic Power Development Plant, East Pittsburgh Plant, Forest Hills, Pittsburgh, Pennsylvania I-l Exhibit II: Documents Supporting the Certification of Westinghouse Atomic Power Development Plant, East Pittsburgh Plant, Forest Hills, Pittsburgh, Pennsylvania iii II-1 . . .- .__.^ I ^_... _.-__^-____-. - CERTIFICATION DOCKET WESTINGHOUSE ATOMIC POWER DEVELOPMENT PLANT

174

Princeton Plasma Physics Lab - General Atomics (GA)  

NLE Websites -- All DOE Office Websites (Extended Search)

general-atomics-ga General general-atomics-ga General Atomics en The Scorpion's Strategy: "Catch and Subdue" http://www.pppl.gov/node/1132

American Fusion News Category: 
atomics-ga">General Atomics (GA)
175

The Atomic Energy Commission By Alice Buck  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Atomic Energy Atomic Energy Commission By Alice Buck July 1983 U.S. Department of Energy Office of Management Office of the Executive Secretariat Office of History and Heritage Resources 1 Introduction Almost a year after World War II ended, Congress established the United States Atomic Energy Commission to foster and control the peacetime development of atomic science and technology. Reflecting America's postwar optimism, Congress declared that atomic energy should be employed not only in the Nation's defense, but also to promote world peace, improve the public welfare, and strengthen free competition in private

176

Precision spectroscopy of the helium atom.  

SciTech Connect

Persistent efforts in both theory and experiment have yielded increasingly precise understanding of the helium atom. Because of its simplicity, the helium atom has long been a testing ground for relativistic and quantum electrodynamic effects in few-body atomic systems theoretically and experimentally. Comparison between theory and experiment of the helium spectroscopy in 1s2p{sup 3}P{sub J} can potentially extract a very precise value of the fine structure constant a. The helium atom can also be used to explore exotic nuclear structures. In this paper, we provide a brief review of the recent advances in precision calculations and measurements of the helium atom.

Hu, S.-M.; Lu, Z.-T.; Yan, Z.-C.; Physics; Univ. of Science and Technology of China; Univ. of Chicago; Univ. of New Brunswick

2009-06-01T23:59:59.000Z

177

Monitoring atom-atom entanglement and decoherence in a solvable tripartite open system in cavity QED  

E-Print Network (OSTI)

We solve exactly the dynamics of two strongly-driven two-level atoms resonantly coupled to a dissipative cavity field mode. Starting with the cavity field vacuum state, we show that the entanglement of the atom-atom subsystem cannot be created or increased. On the other hand, when the atoms are initially entangled the atomic Hilbert space divides into two subspaces. One of them is decoherence free so that the initial atomic entanglement remains available for applications, even in presence of a low enough atomic decay rate. In the other subspace a measure of entanglement, decoherence, and also purity, are described by a similar functional behavior that can be monitored by joint atomic measurements. Furthermore, we show the possible generation of Schr\\"odinger-cat-like states for the whole system in the transient regime, as well as of entanglement for the cavity field and the atom-atom subsystems conditioned by measurements on the complementary subsystem.

Bina, Matteo; Lulli, Alfredo; Solano, Enrique

2007-01-01T23:59:59.000Z

178

Stability of a superconductive atom chip with persistent current  

SciTech Connect

The lifetime of {sup 87}Rb atoms trapped in a z wire trap generated by a closed-circuit superconductive current on a MgB{sub 2} strip is measured as a function of the distance between the atom and the strip. The lifetime is found to be longer than 10 s at a distance of 40 {mu}m. This value is an order of magnitude longer than the lifetime of a trap generated by a normal current at the same distance. However, it is many orders of magnitude shorter than the theoretical decay rate induced by the spin-flip transition caused by the fluctuation of the current. This shows that for a type-II superconductor the dominant trap loss mechanism is not the spin-flip transition caused by noise as with a normal current atom trap. An analysis of our measurement suggests that magnetic field distortion resulting from flux penetration into the superconductor leads to much faster decay.

Hufnagel, Christoph; Mukai, Tetsuya [NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198 (Japan); CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan); Shimizu, Fujio [NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198 (Japan); CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 (Japan); Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 113-8585 (Japan)

2009-05-15T23:59:59.000Z

179

Manhattan Project: Atomic Discoveries, 1890s-1939  

Office of Scientific and Technical Information (OSTI)

Excerpt from the comic book "Adventures Inside the Atom." Click on this image or visit the "Library" to view the whole comic book. ATOMIC DISCOVERIES Excerpt from the comic book "Adventures Inside the Atom." Click on this image or visit the "Library" to view the whole comic book. ATOMIC DISCOVERIES (1890s-1939) Events A Miniature Solar System, 1890s-1919 Exploring the Atom, 1919-1932 Atomic Bombardment, 1932-1938 The Discovery of Fission, 1938-1939 Fission Comes to America, 1939 Philosophers of Ancient Greece reasoned that all matter in the universe must be composed of fundamental, unchangeable, and indivisible objects, which they called "atoma" ("ατoµα"). The exact nature of these atoms remained elusive, however, despite centuries of attempts by alchemists to create a "philosopher's stone" that could transmute atoms of lead to gold, prove the Greeks wrong, and make its inventors Modern model of an atom very rich. It was only in the late 1890s and the early twentieth-century that this view of a solid atom, bouncing around the universe like a billiard ball, was replaced by an atom that resembled more a miniature solar system, its electrons orbiting around a small nucleus. Explorations into the nature of the atom from 1919 to 1932 confirmed this new model, especially with Ernest Rutherford's 1919 success in finally transmuting an atom of one substance into another and with James Chadwick's 1932 discovery of the elusive final basic particle of the atom, the neutron. From 1932 to 1938, scientists around the world learned a great deal more about atoms, primarily by bombarding the nuclei of atoms and using a variety of particle accelerators. In 1938, word came from Berlin of the most startling result of them all: the nucleus of an atom could actually be split in two, or "fissioned." This breakthrough was quickly confirmed in the United States and elsewhere. According to the theories of Albert Einstein, the fission of an atom should result in a release of energy. An "atomic bomb" was now no longer just science fiction -- it was a distinct possibility.

180

Hydrogen Atom in Relativistic Motion  

E-Print Network (OSTI)

The Lorentz contraction of bound states in field theory is often appealed to in qualitative descriptions of high energy particle collisions. Surprisingly, the contraction has not been demonstrated explicitly even in simple cases such as the hydrogen atom. It requires a calculation of wave functions evaluated at equal (ordinary) time for bound states in motion. Such wave functions are not obtained by kinematic boosts from the rest frame. Starting from the exact Bethe-Salpeter equation we derive the equal-time wave function of a fermion-antifermion bound state in QED, i.e., positronium or the hydrogen atom, in any frame to leading order in alpha. We show explicitly that the bound state energy transforms as the fourth component of a vector and that the wave function of the fermion-antifermion Fock state contracts as expected. Transverse photon exchange contributes at leading order to the binding energy of the bound state in motion. We study the general features of the corresponding fermion-antifermion-photon Fock states, and show that they do not transform by simply contracting. We verify that the wave function reduces to the light-front one in the infinite momentum frame.

M. Jarvinen

2004-11-16T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Charge trapping characteristics of Au nanocrystals embedded in remote plasma atomic layer-deposited Al{sub 2}O{sub 3} film as the tunnel and blocking oxides for nonvolatile memory applications  

Science Conference Proceedings (OSTI)

Remote plasma atomic layer deposited (RPALD) Al{sub 2}O{sub 3} films were investigated to apply as tunnel and blocking layers in the metal-oxide-semiconductor capacitor memory utilizing Au nanocrystals (NCs) for nonvolatile memory applications. The interface stability of an Al{sub 2}O{sub 3} film deposited by RPALD was studied to observe the effects of remote plasma on the interface. The interface formed during RPALD process has high oxidation states such as Si{sup +3} and Si{sup +4}, indicating that RPALD process can grow more stable interface which has a small amount of fixed oxide trap charge. The significant memory characteristics were also observed in this memory device through the electrical measurement. The memory device exhibited a relatively large memory window of 5.6 V under a 10/-10 V program/erase voltage and also showed the relatively fast programming/erasing speed and a competitive retention characteristic after 10{sup 4} s. These results indicate that Al{sub 2}O{sub 3} films deposited via RPALD can be applied as the tunnel and blocking oxides for next-generation flash memory devices.

Lee, Jaesang; Kim, Hyungchul; Park, Taeyong; Ko, Youngbin; Ryu, Jaehun; Jeon, Heeyoung; Park, Jingyu; Jeon, Hyeongtag [Department of Nano-scale Semiconductor Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of); Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea and R and D Division, Hynix Semiconductor, Inc., Icheon, Gyeonggi-do 467-701 (Korea, Republic of); Division of Materials Science and Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of); Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea and R and D Division, Hynix Semiconductor, Inc., Icheon, Gyeonggi-do 467-701 (Korea, Republic of); Department of Nano-scale Semiconductor Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of); Department of Nano-scale Semiconductor Engineering, Hanyang University, Seoul 133-791, Korea and Division of Materials Science and Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of)

2012-01-15T23:59:59.000Z

182

CTrigger: Exposing Atomicity Violation Bugs from Their Hiding Places  

E-Print Network (OSTI)

of the two molecules, broken down by atom, helps the user to understand which atoms of the drug and protein

Lu, Shan

183

Monitoring atom-atom entanglement and decoherence in a solvable tripartite open system in cavity QED  

E-Print Network (OSTI)

We present a fully analytical solution of the dynamics of two strongly-driven atoms resonantly coupled to a dissipative cavity field mode. We show that an initial atom-atom entanglement cannot be increased. In fact, the atomic Hilbert space divides into two subspaces, one of which is decoherence free so that the initial atomic entanglement remains available for applications, even in presence of a low enough atomic decay rate. In the other subspace a measure of entanglement, decoherence, and also purity, are described by a similar functional behavior that can be monitored by joint atomic measurements. Furthermore, we show the possible generation of Schr\\"odinger-cat-like states for the whole system in the transient regime, as well as of entanglement for the cavity field and the atom-atom subsystems conditioned by measurements on the complementary subsystem.

Matteo Bina; Federico Casagrande; Alfredo Lulli; Enrique Solano

2007-11-08T23:59:59.000Z

184

Atomic force microscope: Enhanced sensitivity  

SciTech Connect

Atomic force microscopes (AFMs) are a recent development representing the state of the art in measuring ultrafine surface features. Applications are found in such fields of research as biology, microfabrication, material studies, and surface chemistry. Fiber-optic interferometer techniques developed at LLNL offer the potential of improving the vertical resolution of these instruments by up to 2 orders of magnitude. We are attempting to replace the current AFM measurement scheme, which consists of an optical beam deflection approach, with our fiber-optic interferometer scheme, a much more sensitive displacement measurement technique. In performing this research, we hope to accomplish two important goals; (1) to enhance the sensitivity of the AFM, and (2) to achieve important improvements in our fiber-optic interferometer technology.

Davis, D.T.

1995-06-01T23:59:59.000Z

185

Hyperbaric hydrothermal atomic force microscope  

SciTech Connect

A hyperbaric hydrothermal atomic force microscope (AFM) is provided to image solid surfaces in fluids, either liquid or gas, at pressures greater than normal atmospheric pressure. The sample can be heated and its surface imaged in aqueous solution at temperatures greater than 100.degree. C. with less than 1 nm vertical resolution. A gas pressurized microscope base chamber houses the stepper motor and piezoelectric scanner. A chemically inert, flexible membrane separates this base chamber from the sample cell environment and constrains a high temperature, pressurized liquid or gas in the sample cell while allowing movement of the scanner. The sample cell is designed for continuous flow of liquid or gas through the sample environment.

Knauss, Kevin G. (Livermore, CA); Boro, Carl O. (Milpitas, CA); Higgins, Steven R. (Laramie, WY); Eggleston, Carrick M. (Laramie, WY)

2002-01-01T23:59:59.000Z

186

The Harnessed Atom | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Services » The Harnessed Atom Services » The Harnessed Atom The Harnessed Atom The Harnessed Atom The Harnessed Atom is a new middle school science, technology, engineering, and math (STEM) curriculum extension that focuses on nuclear science and energy. It offers teachers accurate, unbiased, and up-to-date information on the roles that energy and nuclear science play in our lives. The curriculum includes essential principles and fundamental concepts of energy science. This teacher's kit is an updated and expanded edition of the acclaimed 1985 Harnessed Atom curriculum from the U.S. Department of Energy. It was developed with extensive input from classroom teachers across the country in pilot test reviews and workshops, as well as technical reviews from scientists and experts at universities, professional societies, and

187

A Single Atom as a Mirror of an Optical Cavity  

E-Print Network (OSTI)

By tightly focussing a laser field onto a single cold ion trapped in front of a far-distant dielectric mirror, we could observe a quantum electrodynamic effect whereby the ion behaves as the optical mirror of a Fabry-P\\'erot cavity. We show that the amplitude of the laser field is significantly altered due to a modification of the electromagnetic mode structure around the atom in a novel regime in which the laser intensity is already changed by the atom alone. e propose a direct application of this system as a quantum memory for single photons.

G. Htet; L. Slodi?ka; M. Hennrich; R. Blatt

2011-05-10T23:59:59.000Z

188

Optimized sympathetic cooling of atomic mixtures via fast adiabatic strategies  

SciTech Connect

We discuss fast frictionless cooling techniques in the framework of sympathetic cooling of cold atomic mixtures. It is argued that optimal cooling of an atomic species--in which the deepest quantum degeneracy regime is achieved--may be obtained by means of sympathetic cooling with another species whose trapping frequency is dynamically changed to maintain constancy of the Lewis-Riesenfeld adiabatic invariant. Advantages and limitations of this cooling strategy are discussed, with particular regard to the possibility of cooling Fermi gases to a deeper degenerate regime.

Choi, Stephen; Sundaram, Bala [Department of Physics, University of Massachusetts, Boston, Massachusetts 02125 (United States); Onofrio, Roberto [Dipartimento di Fisica ''Galileo Galilei'', Universita di Padova, Via Marzolo 8, Padova I-35131 (Italy); Department of Physics, University of Massachusetts, Boston, Massachusetts 02125 (United States); Institute for Theoretical Atomic, Molecular and Optical Physics (ITAMP), Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

2011-11-15T23:59:59.000Z

189

Manhattan Project: Atomic Bombardment, 1932-1938  

Office of Scientific and Technical Information (OSTI)

Solvay Physics Conference, Brussels, October 1933 ATOMIC BOMBARDMENT Solvay Physics Conference, Brussels, October 1933 ATOMIC BOMBARDMENT (1932-1938) Events > Atomic Discoveries, 1890s-1939 A Miniature Solar System, 1890s-1919 Exploring the Atom, 1919-1932 Atomic Bombardment, 1932-1938 The Discovery of Fission, 1938-1939 Fission Comes to America, 1939 M. Stanley Livingston and Ernest O. Lawrence in front of a 27-inch cyclotron, Rad Lab, University of California, Berkeley, 1934. In the 1930s, scientists learned a tremendous amount about the structure of the atom by bombarding it with sub-atomic particles. Ernest O. Lawrence's cyclotron, the Cockroft-Walton machine, and the Van de Graaff generator, developed by Robert J. Van de Graaff at Princeton University, were particle accelerators designed to bombard the nuclei of various elements to disintegrate atoms. Attempts of the early 1930s to split atoms, however, required huge amounts of energy because the first accelerators used proton beams and alpha particles as sources of energy. Since protons and alpha particles are positively charged, they Albert Einstein met substantial resistance from the positively charged target nucleus when they attempted to penetrate atoms. Even high-speed protons and alpha particles scored direct hits on a nucleus only approximately once in a million tries. Most simply passed by the target nucleus. Not surprisingly, Ernest Rutherford, Albert Einstein (right), and Niels Bohr regarded particle bombardment as useful in furthering knowledge of nuclear physics but believed it unlikely to meet public expectations of harnessing the power of the atom for practical purposes anytime in the near future. In a 1933 interview, Rutherford called such expectations "moonshine." Einstein compared particle bombardment with shooting in the dark at scarce birds, while Bohr, the Danish Nobel laureate, agreed that the chances of taming atomic energy were remote.

190

Theory of atomic motion in resonant radiation  

SciTech Connect

Atomic motion in resonant and near resonant electromagnetic radiation is investigated theoretically. The exposition begins with a study of atomic motion in a resonant standing light wave, with a view toward isotope separation by selective photodeflection, and proceeds to the investigation of more general problems of atomic motion in resonant radiation. The body of the work consists of six chapters, each of which was prepared as a manuscript for publication in the open literature.

Cook, R.J.

1980-03-01T23:59:59.000Z

191

Method for enhanced atomization of liquids  

DOE Patents (OSTI)

In a process for atomizing a slurry or liquid process stream in which a slurry or liquid is passed through a nozzle to provide a primary atomized process stream, an improvement which comprises subjecting the liquid or slurry process stream to microwave energy as the liquid or slurry process stream exits the nozzle, wherein sufficient microwave heating is provided to flash vaporize the primary atomized process stream.

Thompson, Richard E. (27121 Puerta del Oro, Mission Viejo, CA 92691); White, Jerome R. (44755 Wyandotte, Hemet, CA 92544)

1993-01-01T23:59:59.000Z

192

NIST Handbook of Basic Atomic Spectroscopic Data  

Science Conference Proceedings (OSTI)

... The compilation includes data for the neutral and singly-ionized atoms of all elements hydrogen through einsteinium (Z = 1-99). ... Access the Data. ...

2011-12-09T23:59:59.000Z

193

NIST Atomic Form Factors: Concerns with standard ...  

Science Conference Proceedings (OSTI)

... pair production cross-section in the nuclear field (? n ... upon angle (in f 0 ) and energy (in f ... All general theories make the isolated atom approximation ...

194

A History of the Atomic Energy Commission  

Energy.gov (U.S. Department of Energy (DOE))

A History of the Atomic Energy Commission - written by Alice L. BuckWashington, D.C.: U.S. Department of Energy, July 1983.41 pp.

195

Atom Probe Tomography and Transmission Electron Microscopy ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Atom probe tomography (APT) and analytical transmission .... of a Leaking Type 316 Socket Weld in a Boron Injection Tank Sampling Line.

196

Prospects for Atomic-Scale Tomography  

Science Conference Proceedings (OSTI)

Abstract Scope, Atomic-scale tomography (AST) may be defined as any technique that ... Initial Age Hardening and Nanostructural Evolution in a Cu-Ni-P Alloy.

197

Atom Manipulation with the Scanning Tunneling Microscope  

Science Conference Proceedings (OSTI)

... nanostructure from an unknown random collection of atoms without human intervention. ... a set of extensible rules, and allows for error correction. ...

2013-04-26T23:59:59.000Z

198

Materials Synthesis from Atoms to Systems | ORNL  

NLE Websites -- All DOE Office Websites (Extended Search)

to produce unique single crystals and epitaxial structures that are deposited with atomic-level precision is critical for many applications, such as thermoelectrics,...

199

NIST Unveils Chip-Scale Atomic Clock  

Science Conference Proceedings (OSTI)

... 100 times smaller than any other atomic clockhas ... precise timekeeping in portable, battery-powered devices ... to be operated on batteries) and are ...

2012-12-20T23:59:59.000Z

200

Schroedinger's Cat in an Atomic Cage  

Science Conference Proceedings (OSTI)

... Schroedinger's Cat in an Atomic Cage. ... ``Schroedinger's cat'' soon became a shorthand way to refer to a whole class of superposed states. ...

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Primary Atomic Frequency Standards at NIST  

Science Conference Proceedings (OSTI)

... a set of four quartz oscillators calibrated against the mean solar second [4 ... The cesium oven, operated near 100 C, creates a vapor of atoms that are ...

2001-02-04T23:59:59.000Z

202

Handbook of Basic Atomic Spectroscopic Data  

Science Conference Proceedings (OSTI)

... FW96 JR Fuhr and WL Wiese, NIST Atomic Transition Probability Tables, CRC Handbook of Chemistry and Physics, 77th ed., DR Lide, ed. CRC ...

2008-06-09T23:59:59.000Z

203

Critically Evaluated Atomic Transition Probabilities for Sulfur ...  

Science Conference Proceedings (OSTI)

... In this new work all ionization stages (except for hydro- genic) are covered. The data are presented in separate tables for each atom and ion. ...

2013-04-16T23:59:59.000Z

204

Quantization of Atomic and Nuclear Rest Masses  

E-Print Network (OSTI)

We were able to quantize phenomenologically the first time the atomic and nuclear rest masses. Note that this quantization rule is justified for atoms and nuclei with different A, N and Z and the nuclei and atoms represent a coherent synchronized systems - a complex of coupled oscillators (resonators). The cooperative resonance synchronization mechanisms are responsible for explanation of how the electron volt world can influence the nuclear mega electron volt world. It means that we created new possibilities for inducing and controlling nuclear reactions by atomic processes.

F. A. Gareev; G. F. Gareeva; I. E. Zhidkova

2007-08-02T23:59:59.000Z

205

Multichannel calculations for frequency shift and line broadening cross sections in collisions of cold hydrogen atoms  

E-Print Network (OSTI)

Zygelman,B. Jamieson,M.J. Stancil,P.C. Dalgarno,A. Workshop on Collisions of Cold Trapped Atoms at Joint Institute for Laboratory Astrophysics, Boulder, CO, U.S.A.

Zygelman, B.; Jamieson, M.J.

206

Matter-Wave Scattering from Ultracold Atoms in an Optical Lattice  

E-Print Network (OSTI)

We study matter-wave scattering from an ultracold, many-body atomic system trapped in an optical lattice. The angular cross section of the target lattice for a matter wave is determined and is demonstrated to have a strong ...

Sanders, Scott N.

207

Laser-cooled atoms inside a hollow-core photonic-crystal fiber  

E-Print Network (OSTI)

We describe the loading of laser-cooled rubidium atoms into a single-mode hollow-core photonic-crystal fiber. Inside the fiber, the atoms are confined by a far-detuned optical trap and probed by a weak resonant beam. We ...

Bajcsy, M.

208

Electronic energy transfer between state selected metastable argon atoms and ground state krypton atoms  

E-Print Network (OSTI)

1007 Electronic energy transfer between state selected metastable argon atoms and ground state that the relative populations of the N2 (C, 3nu) product vibrational and rotational substates were dependent,0) atoms to ground state Kr atoms, which also shows large differences between the two metastable Ar states

Paris-Sud XI, Université de

209

Relativistic atomic physics at the SSC  

SciTech Connect

This report discusses the following proposed work for relativistic atomic physics at the Superconducting Super Collider: Beam diagnostics; atomic physics research; staffing; education; budget information; statement concerning matching funds; description and justification of major items of equipment; statement of current and pending support; and assurance of compliance.

NONE

1990-12-31T23:59:59.000Z

210

Atomic Data Needs for Modeling Photoionized Plasmas  

E-Print Network (OSTI)

Many of the fundamental questions in astrophysics can be addressed using spectroscopic observations of photoionized cosmic plasmas. However, the reliability of the inferred astrophysics depends on the accuracy of the underlying atomic data used to interpret the collected spectra. In this paper, we review some of the most glaring atomic data needs for better understanding photoionized plasmas.

Daniel Wolf Savin

2001-08-03T23:59:59.000Z

211

Texture of atomic layer deposited ruthenium  

Science Conference Proceedings (OSTI)

Ruthenium films were grown by plasma enhanced atomic layer deposition (ALD) on Si(100) and ALD TiN. X-ray diffraction (XRD) showed that the as-deposited films on Si(100) were polycrystalline, on TiN they were (002) oriented. After annealing at 800^oC ... Keywords: Ammonia plasma, Atomic layer deposition, Ruthenium, Silicide, Texture

J. Musschoot; Q. Xie; D. Deduytsche; K. De Keyser; D. Longrie; J. Haemers; S. Van den Berghe; R. L. Van Meirhaeghe; J. D'Haen; C. Detavernier

2010-10-01T23:59:59.000Z

212

Implementing Synchronous Coordinated Atomic Actions Based on  

E-Print Network (OSTI)

the execution of action participants. A very important decision was to structure any atomic action as a package: concurrent systems, atomicity, coordinated error recovery, fault tolerant software structuring, conversations to improve the structuring of cooperative concurrent systems and to incorporate fault tolerance

Newcastle upon Tyne, University of

213

Fast Access to Distributed Atomic Memory  

Science Conference Proceedings (OSTI)

We study efficient and robust implementations of an atomic read-write data structure over an asynchronous distributed message-passing system made of reader and writer processes, as well as a number of servers implementing the data structure. We determine ... Keywords: Byzantine failures, atomic registers, distributed algorithms, fault-tolerance, shared-memory emulations, time-complexity

Partha Dutta; Rachid Guerraoui; Ron R. Levy; Marko Vukoli?

2010-08-01T23:59:59.000Z

214

Instead of splitting the atom --the  

E-Print Network (OSTI)

Instead of splitting the atom - - the principle behind the 1940s Manhattan Project that build of the Sun and the stars. BACK STAR POWER: ITER, BOLDEST NUCLEAR INITIATIVE SINCE MANHATTAN PROJECT Received infinite. Instead of splitting the atom -- the principle behind the 1940s Manhattan Project that build

215

Atomic magnetometer for human magnetoencephalograpy.  

SciTech Connect

We have developed a high sensitivity (<5 fTesla/{radical}Hz), fiber-optically coupled magnetometer to detect magnetic fields produced by the human brain. This is the first demonstration of a noncryogenic sensor that could replace cryogenic superconducting quantum interference device (SQUID) magnetometers in magnetoencephalography (MEG) and is an important advance in realizing cost-effective MEG. Within the sensor, a rubidium vapor is optically pumped with 795 laser light while field-induced optical rotations are measured with 780 nm laser light. Both beams share a single optical axis to maximize simplicity and compactness. In collaboration with neuroscientists at The Mind Research Network in Albuquerque, NM, the evoked responses resulting from median nerve and auditory stimulation were recorded with the atomic magnetometer and a commercial SQUID-based MEG system with signals comparing favorably. Multi-sensor operation has been demonstrated with two AMs placed on opposite sides of the head. Straightforward miniaturization would enable high-density sensor arrays for whole-head magnetoencephalography.

Schwindt, Peter; Johnson, Cort N.

2010-12-01T23:59:59.000Z

216

Shape coexistence in atomic nuclei  

Science Conference Proceedings (OSTI)

Shape coexistence in nuclei appears to be unique in the realm of finite many-body quantum systems. It differs from the various geometrical arrangements that sometimes occur in a molecule in that in a molecule the various arrangements are of the widely separated atomic nuclei. In nuclei the various ''arrangements'' of nucleons involve (sets of) energy eigenstates with different electric quadrupole properties such as moments and transition rates, and different distributions of proton pairs and neutron pairs with respect to their Fermi energies. Sometimes two such structures will ''invert'' as a function of the nucleon number, resulting in a sudden and dramatic change in ground-state properties in neighboring isotopes and isotones. In the first part of this review the theoretical status of coexistence in nuclei is summarized. Two approaches, namely, microscopic shell-model descriptions and mean-field descriptions, are emphasized. The second part of this review presents systematic data, for both even- and odd-mass nuclei, selected to illustrate the various ways in which coexistence is observed in nuclei. The last part of this review looks to future developments and the issue of the universality of coexistence in nuclei. Surprises continue to be discovered. With the major advances in reaching to extremes of proton-neutron number, and the anticipated new ''rare isotope beam'' facilities, guidelines for search and discovery are discussed.

Heyde, Kris; Wood, John L. [Department of Physics and Astronomy, Ghent University, Proeftuinstraat 86, B-9000 Gent (Belgium); School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430 (United States)

2011-10-01T23:59:59.000Z

217

Isotopic Abundance in Atom Trap Trace Analysis  

isotopes for climate change and nuclear proliferation interests. The Invention Argonne scientists have created a novel method and system for

218

Quantum state manipulation of trapped atomic ions  

Science Conference Proceedings (OSTI)

... Jones, RR, Raman, CS, Schumacher, SW & Bucksbaum, PH 1993 Phys. ... Turchette, QA, Hood, C., Lange, W., Mabushi, H. & Kimble, HJ 1995 Phys. ...

2002-08-13T23:59:59.000Z

219

Isotopic Abundance in Atom Trap Trace Analysis  

E-Print Network (OSTI)

-mail:maynard@anl.gov Website:http://www.anl.gov/ techtransfer/ ABOUT ARGONNE TECHNOLOGY TRANSFER Argonne

Kemner, Ken

220

Cavity cooling of a single atom  

E-Print Network (OSTI)

All conventional methods to laser-cool atoms rely on repeated cycles of optical pumping and spontaneous emission of a photon by the atom. Spontaneous emission in a random direction is the dissipative mechanism required to remove entropy from the atom. However, alternative cooling methods have been proposed1, 2 for a single atom strongly coupled to a high-finesse cavity; the role of spontaneous emission is replaced by the escape of a photon from the cavity. Application of such cooling schemes would improve the performance of atom cavity systems for quantum information processing3, 4. Furthermore, as cavity cooling does not rely on spontaneous emission, it can be applied to systems that cannot be laser-cooled by conventional methods; these include molecules2 (which do not have a closed transition) and collective excitations of

P. Maunz; I. Schuster; N. Syassen; P. W. H. Pinkse; G. Rempe

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Oxidation Resistance of Reactive Atoms in Graphene  

SciTech Connect

We have found that reactive elements that are normally oxidized at room temperature are present as individual atoms or clusters on and in graphene. Oxygen is present in these samples but it is only detected in the thicker amorphous carbon layers present in the graphene specimens we have examined. However, we have seen no evidence that oxygen reacts with the impurity atoms and small clusters of these normally reactive elements when they are incorporated in the graphene layers. First principles calculations suggest that the oxidation resistance is due to kinetic effects such as preferential bonding of oxygen to nonincorporated atoms and H passivation. The observed oxidation resistance of reactive atoms in graphene may allow the use of these incorporated metals in catalytic applications. It also opens the possibility of designing and producing electronic, opto-electronic, and magnetic devices based on these normally reactive atoms.

Chisholm, Matthew F [ORNL; Duscher, Gerd [University of Tennessee, Knoxville (UTK); Windl, Wolfgang [Ohio State University

2012-01-01T23:59:59.000Z

222

Hewlett and Duncan - Atomic Shield | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Duncan - Atomic Shield Duncan - Atomic Shield Hewlett and Duncan - Atomic Shield Hewlett, Richard G. and Francis Duncan. Atomic Shield, 1947-1952. U.S. Atomic Energy Comission, 1972. The second volume of the three volume A History of the United States Atomic Energy Commission. Text in each PDF is fully searchable. "Hewlett and Duncan - Atomic Shield (complete).pdf" contains the complete text and images from Atomic Shield. 12mb "Hewlett and Duncan - Atomic Shield (figures only).pdf" contains hi-res (600dpi) scans of the images from Atomic Shield. 30mb Hewlett and Duncan - Atomic Shield (complete).pdf Hewlett and Duncan - Atomic Shield (figures only).pdf More Documents & Publications A History of the Atomic Energy Commission Hewlett and Duncan, Nuclear Navy, 1946-1962

223

Topological Mott insulators of ultracold atomic mixtures induced by interactions in one-dimensional optical superlattices  

E-Print Network (OSTI)

We present exactly solvable examples that topological Mott insulators can emerge from topologically trivial states due to strong interactions between atoms for atomic mixtures trapped in one-dimensional optical superlattice systems. The topological Mott insulating state is characterized by nonzero Chern number and appears in the strongly interacting limit as long as the total band filling factor is an integer, which is not sensitive to the filling of each component. The topological nature of the Mott phase can be revealed by observing the density profile of the trapped system. Our results can be also generalized to the multi-component atomic systems.

Zhihao Xu; Shu Chen

2013-01-20T23:59:59.000Z

224

On the energy of electric field in hydrogen atom  

E-Print Network (OSTI)

It is shown that hydrogen atom is a unique object in physics having negative energy of electric field, which is present in the atom. This refers also to some hydrogen-type atoms: hydrogen anti-atom, atom composed of proton and antiproton, and positronium.

Yuri Kornyushin

2009-05-27T23:59:59.000Z

225

Instrument Series: Microscopy Atom Probe The LEAP  

NLE Websites -- All DOE Office Websites (Extended Search)

Atom Probe Atom Probe The LEAP ® 4000 XHR local electrode atom probe tomography instrument enabled the first- ever comprehensive and accurate 3-D chemical imaging studies of low electrical conductivity materials, such as ceramics, semiconductors and oxides. The LEAP capability is assisting EMSL's efforts to further scientific advancements in interface analysis and microstructural characterization, providing a new tool for understanding the relationship between the nanoscale structure of materials and their macroscopic properties. Research Applications Geochemistry - Studying chemical processes that compose rocks and soils has long been used to determine matter cycles and transport in the environment, which supports critical EMSL research in areas including bioremediation.

226

Cold Light from Hot Atoms and Molecules  

Science Conference Proceedings (OSTI)

The introduction of rare earth atoms and molecules into lighting discharges led to great advances in efficacy of these lamps. Atoms such as Dy, Ho and Ce provide excellent radiation sources for lighting applications, with rich visible spectra, such that a suitable combination of these elements can provide high quality white light. Rare earth molecules have also proved important in enhancing the radiation spectrum from phosphors in fluorescent lamps. This paper reviews some of the current aspects of lighting research, particularly rare earth chemistry and radiation, and the associated fundamental atomic and molecular data.

Lister, Graeme [OSRAM SYLVANIA, CRSL, 71 Cherry Hill Drive, Beverly, MA (United States); Curry, John J. [National Institute of Standards and Technology, Gaithersburg, MD (United States)

2011-05-11T23:59:59.000Z

227

ATOMIZATION METHOD OF MAKING URANIUM POWDER  

SciTech Connect

Atomized U powder was produced by forming an electric arc between two U electrodes in an inert atmosphere and sending a high velocity stream of inert gas through the arc. Uranium particles obtained by this method were of spherical shape; smaller particles contained mostly small grains, and larger particles wore characterizcd by larger grains. The particles were ductile and could be hotpressed to a compact of high density. The temporary equipment used for those preliminary tests on atomization was not adequate to control particle size. Suggestions for the production of atomized U powder of controllable quality are included. (arth)

Hausner, H.H.; Mansfield, H.

1950-08-01T23:59:59.000Z

228

The Manhattan Project: Making the atomic bomb  

SciTech Connect

This article is a short history of the origins and development of the American atomic bomb program during World War II. Beginning with the scientific developments of the pre-war years, the monograph details the role of US government in conducting a secret, nationwide enterprise that took science from the laboratory and into combat with an entirely new type of weapon. The monograph concludes with a discussion of the immediate postwar period, the debate over the Atomic Energy Act of 1946, and the founding of the Atomic Energy Commission.

Gosling, F.G.

1994-09-01T23:59:59.000Z

229

1984 Bibliography of atomic and molecular processes  

Science Conference Proceedings (OSTI)

This annotated bibliography includes papers on atomic and molecular processes published during 1984. Sources include scientific journals, conference proceedings, and books. Each entry is designated by one or more of the 114 categories of atomic and molecular processes used by the Controlled Fusion Atomic Data Center, Oak Ridge National Laboratory to classify data. Also indicated is whether the work was experimental or theoretical, what energy range was covered, what reactants were investigated, and the country of origin of the first author. Following the bibliographical listing, the entries are indexed according to the categories and according to reactants within each subcategory.

Barnett, C.F.; Gilbody, H.B.; Gregory, D.C.; Griffin, P.M.; Havener, C.C.; Howard, A.M.; Kirkpatrick, M.I.; McDaniel, E.W.; Meyer, F.W.; Morgan, T.J. (comps.)

1985-04-01T23:59:59.000Z

230

1985 bibliography of atomic and molecular processes  

SciTech Connect

This annotated bibliography includes papers on atomic and molecular processes published during 1985. Sources include scientific journals, conference proceedings, and books. Each entry is designated by one or more of the 114 categories of atomic and molecular processes used by the Controlled Fusion Atomic Data Center, Oak Ridge National Laboratory to classify data. Also indicated is whether the work was experimental or theoretical, what energy range was covered, what reactants were investigated, and the country of origin of the first author. Following the bibliographical listing, the entries are indexed according to the categories and according to reactants within each subcategory.

Barnett, C.F.; Gilbody, H.B.; Gregory, D.C.; Griffin, P.M.; Havener, C.C.; Howald, A.M.; Kirkpatrick, M.I.; McDaniel, E.W.; Meyer, F.W.; Morgan, T.J. (comps.)

1986-06-01T23:59:59.000Z

231

The Manhattan Project: Making the Atomic Bomb | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

The Manhattan Project: Making the Atomic Bomb The Manhattan Project: Making the Atomic Bomb This report is an account of work on the atomic bomb. The Manhattan Project: Making the...

232

How long is the life span of an atom?  

NLE Websites -- All DOE Office Websites (Extended Search)

How long is the life span of an atom? Atoms are forever But let me explain. Atoms are made of a central core containing a collection of protons and neutrons. Almost all of the...

233

Studying coherence in ultra-cold atomic gases  

E-Print Network (OSTI)

This thesis will discuss the study of coherence properties of ultra-cold atomic gases. The atomic systems investigated include a thermal cloud of atoms, a Bose-Einstein condensate and a fermion pair condensate. In each ...

Miller, Daniel E. (Daniel Edward)

2007-01-01T23:59:59.000Z

234

Local Atomic Density of Microporous Carbons  

DOE Green Energy (OSTI)

We investigated the structure of two disordered carbons: activated carbon fibers (ACF) and ultramicroporous carbon (UMC). These carbons have highly porous structure with large surface areas and consequently low macroscopic density that should enhance adsorption of hydrogen. We used the atomic pair distribution function to probe the local atomic arrangements. The results show that the carbons maintain an in-plane local atomic structure similar to regular graphite, but the stacking of graphitic layers is strongly disordered. Although the local atomic density of these carbons is lower than graphite, it is only {approx}20% lower and is much higher than the macroscopic density due to the porosity of the structure. For this reason, the density of graphene sheets that have optimum separation for hydrogen adsorption is lower than anticipated.

Dmowski, Wojtek; Contescu, Cristian I.; Llobet, Anna; Gallego, Nidia C.; Egami, Takeskhi (Tennessee-K); (ORNL); (LANL)

2012-07-12T23:59:59.000Z

235

A History of the Atomic Energy Commission  

SciTech Connect

This pamphlet traces the history of the US Atomic Energy Commission's twenty-eight year stewardship of the Nation's nuclear energy program, from the signing of the Atomic Energy Act on August 1, 1946 to the signing of the Energy Reorganization Act on October 11, 1974. The Commission's early concentration on the military atom produced sophisticated nuclear weapons for the Nation's defense and made possible the creation of a fleet of nuclear submarines and surface ships. Extensive research in the nuclear sciences resulted in the widespread application of nuclear technology for scientific, medical and industrial purposes, while the passage of the Atomic Energy Act of 1954 made possible the development of a nuclear industry, and enabled the United States to share the new technology with other nations.

Buck, A.L.

1983-07-01T23:59:59.000Z

236

Buried Interface Analysis Using Atom Probe Tomography  

Science Conference Proceedings (OSTI)

Contributions of Atom Probe Tomography to the Understanding of Steels Control of p-n ... Relationships in a Series of Co-Cr-Cu-Fe-Ni-Al High Entropy Alloys.

237

Atom Probe Tomography for Industrial Applications - Programmaster ...  

Science Conference Proceedings (OSTI)

Contributions of Atom Probe Tomography to the Understanding of Steels Control of p-n ... Relationships in a Series of Co-Cr-Cu-Fe-Ni-Al High Entropy Alloys.

238

Atomic physics of strongly correlated systems  

DOE Green Energy (OSTI)

Theoretical studies of electron correlations of doubly excited electrons in hyperspherical coordinates, and differential and total electron transfer cross sections in fast ion-atom collisions are reported. (GHT)

Lin, C.D.

1981-01-01T23:59:59.000Z

239

CHIANTI: An Atomic Database for Astrophysical Plasmas  

Science Conference Proceedings (OSTI)

Technical Paper / Selected papers from IAEA-NFRI Technical Meeting on Data Evaluation for Atomic, Molecular and Plasma-Material Interaction Processes in Fusion, September 4-7, 2012, Daejeon, Republic of Korea

E. Landi; K. P. Dere; P. R. Young; G. Del Zanna; H. E. Mason

240

Assessment of Atomic Data: Problems and Solutions  

Science Conference Proceedings (OSTI)

Technical Paper / Selected papers from IAEA-NFRI Technical Meeting on Data Evaluation for Atomic, Molecular and Plasma-Material Interaction Processes in Fusion, September 4-7, 2012, Daejeon, Republic of Korea

Kanti M. Aggarwal; Francis P. Keenan

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Atomic Biology, Electrostatics, and Ionic Channels  

E-Print Network (OSTI)

I believe an atomic biology is needed to supplement present day molecular biology, if we are to design and understand proteins, as well as define, make, and use them.

Eisenberg, R S

2008-01-01T23:59:59.000Z

242

ac-driven atomic quantum motor  

E-Print Network (OSTI)

We invent an ac-driven quantum motor consisting of two different, interacting ultracold atoms placed into a ring-shaped optical lattice and submerged in a pulsating magnetic field. While the first atom carries a current, the second one serves as a quantum starter. For fixed zero-momentum initial conditions the asymptotic carrier velocity converges to a unique non-zero value. We also demonstrate that this quantum motor performs work against a constant load.

A. V. Ponomarev; S. Denisov; P. Hanggi

2009-02-03T23:59:59.000Z

243

ac-driven atomic quantum motor  

E-Print Network (OSTI)

We invent an ac-driven quantum motor consisting of two different, interacting ultracold atoms placed into a ring-shaped optical lattice and submerged in a pulsating magnetic field. While the first atom carries a current, the second one serves as a quantum starter. For fixed zero-momentum initial conditions the asymptotic carrier velocity converges to a unique non-zero value. We also demonstrate that this quantum motor performs work against a constant load.

Ponomarev, A V; Hnggi, P

2009-01-01T23:59:59.000Z

244

Resonant spectroscopy of the antihydrogen atom  

SciTech Connect

The spectra of the hydrogen and antihydrogen atoms in the presence of an external electric field are compared. It is shown that the nonresonant corrections to the transition frequency may contain terms linear in the electric field. The existence of these terms does not violate space and time parity and leads to a difference in the resonant spectroscopic measurements for the hydrogen and antihydrogen atoms in an external electric field.

Labzowsky, Leonti [St. Petersburg State University, 198504 Petrodvorets, St. Petersburg, Russia (Russian Federation); Petersburg Nuclear Physics Institute, 188350 Gatchina, St. Petersburg, Russia (Russian Federation); Solovyev, Dmitri [St. Petersburg State University, 198504 Petrodvorets, St. Petersburg, Russia (Russian Federation)

2003-07-01T23:59:59.000Z

245

Neutrino Spectroscopy with Atoms and Molecules  

E-Print Network (OSTI)

We give a comprehensive account of our proposed experimental method of using atoms or molecules in order to measure parameters of neutrinos still undetermined; the absolute mass scale, the mass hierarchy pattern (normal or inverted), the neutrino mass type (Majorana or Dirac), and the CP violating phases including Majorana phases. There are advantages of atomic targets, due to the closeness of available atomic energies to anticipated neutrino masses, over nuclear target experiments. Disadvantage of using atomic targets, the smallness of rates, is overcome by the macro-coherent amplification mechanism. The atomic or molecular process we use is a cooperative deexcitation of a collective body of atoms in a metastable level |e> emitting a neutrino pair and a photon; |e> -> |g> + gamma + nu_i nu_j where nu_i's are neutrino mass eigenstates. The macro-coherence is developed by trigger laser irradiation. We discuss aspects of the macro-coherence development by setting up the master equation for the target quantum state and propagating electric field. With a choice of heavy target atom or molecule such as Xe or I_2 that has a large M1 x E1 matrix element between |e> and |g>, we show that one can determine three neutrino masses along with the mass hierarchy pattern by measuring the photon spectral shape. If one uses a target of available energy of a fraction of 1 eV, Majorana CP phases may be determined. Our master equation, when applied to E1 x E1 transition such as pH_2 vibrational transition Xv=1 -> 0, can describe explosive PSR events in which most of the energy stored in |e> is released within a few nanoseconds. The present paper is intended to be self-contained explaining some details related theoretical works in the past, and further reports new simulations and our ongoing experimental efforts of the project to realize the neutrino mass spectroscopy using atoms/molecules.

Atsushi Fukumi; Susumu Kuma; Yuki Miyamoto; Kyo Nakajima; Itsuo Nakano; Hajime Nanjo; Chiaki Ohae; Noboru Sasao; Minoru Tanaka; Takashi Taniguchi; Satoshi Uetake; Tomonari Wakabayashi; Takuya Yamaguchi; Akihiro Yoshimi; Motohiko Yoshimura

2012-11-21T23:59:59.000Z

246

Atomic scale electron vortices for nanoresearch  

Science Conference Proceedings (OSTI)

Electron vortex beams were only recently discovered and their potential as a probe for magnetism in materials was shown. Here we demonstrate a method to produce electron vortex beams with a diameter of less than 1.2 Angst . This unique way to prepare free electrons to a state resembling atomic orbitals is fascinating from a fundamental physics point of view and opens the road for magnetic mapping with atomic resolution in an electron microscope.

Verbeeck, J.; Van Tendeloo, G. [EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp (Belgium); Schattschneider, P.; Loeffler, S. [Institute for Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040 Wien (Austria); Lazar, S. [FEI Electron Optics, 5600 KA Eindhoven (Netherlands); Canadian Centre for Electron Microscopy and Department of Materials Science and Engineering, McMaster University, Main Street West, Hamilton Ontario, L8S4M1 (Canada); Stoeger-Pollach, M.; Steiger-Thirsfeld, A. [USTEM, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040 Wien (Austria)

2011-11-14T23:59:59.000Z

247

U.S. Energy Secretary Addresses International Atomic Energy Agency...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Secretary Addresses International Atomic Energy Agency General Conference U.S. Energy Secretary Addresses International Atomic Energy Agency General Conference September 19, 2011 -...

248

August 1, 1946: Atomic Energy Act | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1, 1947, all atomic energy activities are transferred to the newly created Atomic Energy Commission in accordance with the Act. Energy.gov Careers & Internships For Staff &...

249

The Manhattan Project: Making of the Atomic Bomb | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Field Sites Power Marketing Administration Other Agencies You are here Home The Manhattan Project: Making of the Atomic Bomb The Manhattan Project: Making of the Atomic...

250

Charge It: Neutral Atoms Made to Act Like Electrically ...  

Science Conference Proceedings (OSTI)

... atoms (BEC) immersed in a constant magnetic field (B0). Using lasers (red arrows), the team alters the atoms' energy-momentum relationship ...

2011-04-01T23:59:59.000Z

251

A Well Collimated Quasi-Continuous Atom Laser  

Science Conference Proceedings (OSTI)

The Quasi-continuous Atom Laser. ... We can develop a rather complete analogy between the so-called "atom laser" and the traditional photon laser. ...

252

Integrated Sustainability Analysis of Atomic Layer Deposition for Microelectronics Manufacturing  

E-Print Network (OSTI)

of Manufacturing and Sustainability Improvement of Nano-Integrated Sustainability Analysis of Atomic Layergrowth at atomic scale. Sustainability of ALD technology

Yuan, Chris Yingchun; David Dornfeld

2010-01-01T23:59:59.000Z

253

Observation of Lithium Ions at Atomic Resolution Using an ...  

Science Conference Proceedings (OSTI)

Presentation Title, Observation of Lithium Ions at Atomic Resolution Using an ... at atomic resolution in several important electrode materials for Li-ion batteries.

254

Bettis and Knolls Atomic Power Laboratories | National Nuclear...  

National Nuclear Security Administration (NNSA)

Power Laboratories Bettis and Knolls Atomic Power Laboratories Bettis and Knolls Atomic Power Laboratories DE-NR0000031 Managed and Operated by Bechtel Marine Propulsion...

255

Atomic Energy Commission Explores Peaceful Uses of Nuclear Explosions...  

National Nuclear Security Administration (NNSA)

Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Atomic Energy Commission Explores Peaceful Uses of ... Atomic Energy Commission Explores Peaceful...

256

Energy Department and French Commission on Atomic Energy and...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy Department and French Commission on Atomic Energy and Alternative Energies Sign New Research and Development Agreement Energy Department and French Commission on Atomic...

257

DOE - Office of Legacy Management -- Gen_Atomics  

NLE Websites -- All DOE Office Websites (Extended Search)

General Atomics Hot Cell Facility, California, Site A Oakland Operations Office site genatomicsmap The General Atomics Hot Cell Facility site was a research laboratory formerly...

258

EA-1053: Decontaminating and Decommissioning the General Atomics...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

53: Decontaminating and Decommissioning the General Atomics Hot Cell Facility, San Diego, California EA-1053: Decontaminating and Decommissioning the General Atomics Hot Cell...

259

Iowa Powder Atomization Technologies, Inc. | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Iowa Powder Atomization Technologies, Inc. America's Next Top Energy Innovator Challenge 6067 likes Iowa Powder Atomization Technologies, Inc. Ames Laboratory Iowa Powder...

260

A Vital Legacy - Biological and Environmental Research in the Atomic Age  

E-Print Network (OSTI)

ation of the Atomic Bomb Casualty Commission, established inthe atomic bombs. The Atomic Bomb Casualty Commis- sion was

Vaughan editor, Douglas

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

M.D.?Lukin, Storage of light in atomic vapor  

E-Print Network (OSTI)

We report an experiment in which a light pulse is decelerated and trapped in a vapor of Rb atoms, stored for a controlled period of time, and then released on demand. We accomplish this storage of light by dynamically reducing the group velocity of the light pulse to zero, so that the coherent excitation of the light is reversibly mapped into a collective Zeeman (spin) coherence of the Rb vapor. PACS numbers 03.67.-a, 42.50.-p, 42.50.Gy Typeset using REVTEX 1 Photons are the fastest and most robust carriers of information, but they are difficult to localize and store. The present Letter reports a proof-of-principle demonstration of a technique [1,2] to trap, store, and release excitations carried by light pulses. Specifically, a pulse of light which is several kilometers long in free space is compressed to a length of a few centimeters and then converted into collective spin excitations in a vapor of Rb atoms. After a controllable storage time, the process is reversed and the atomic coherence is converted

D. F. Phillips; A. Fleischhauer; A. Mair; R. L. Walsworth; M. D. Lukin

2001-01-01T23:59:59.000Z

262

Theoretical Atomic Physics code development IV: LINES, A code for computing atomic line spectra  

SciTech Connect

A new computer program, LINES, has been developed for simulating atomic line emission and absorption spectra using the accurate fine structure energy levels and transition strengths calculated by the (CATS) Cowan Atomic Structure code. Population distributions for the ion stages are obtained in LINES by using the Local Thermodynamic Equilibrium (LTE) model. LINES is also useful for displaying the pertinent atomic data generated by CATS. This report describes the use of LINES. Both CATS and LINES are part of the Theoretical Atomic PhysicS (TAPS) code development effort at Los Alamos. 11 refs., 9 figs., 1 tab.

Abdallah, J. Jr.; Clark, R.E.H.

1988-12-01T23:59:59.000Z

263

Atoms for peace and war, 1953-1961: Eisenhower and the Atomic Energy Commission  

SciTech Connect

This third volume in the official history of the U.S. Atomic Energy Commission covers the years of the Eisenhower Administration.

Hewlett, Richard G.; Holl, Jack M.

1989-12-01T23:59:59.000Z

264

Ultracold Heteronuclear Mixture of Ground and Excited State Atoms  

E-Print Network (OSTI)

We report on the realization of an ultracold mixture of lithium atoms in the ground state and ytterbium atoms in the excited metastable 3P2 state. Such a mixture can support broad magnetic Feshbach resonances which may be utilized for the production of ultracold molecules with an electronic spin degree of freedom, as well as novel Efimov trimers. We investigate the interaction properties of the mixture in the presence of an external magnetic field and find an upper limit for the background interspecies two-body inelastic decay coefficient of K'2 substate. We calculate the dynamic polarizabilities of the Yb 3P2 magnetic substates for a range of wavelengths, and find good agreement with our measurements at 1064nm. Our calculations also allow the identification of magic frequencies where Yb ground and metastable states are identically trapped and the determination of the interspecies van der Waals coefficients.

Khramov, Alexander; Dowd, William; Roy, Richard; Makrides, Constantinos; Petrov, Alexander; Kotochigova, Svetlana; Gupta, Subhadeep

2013-01-01T23:59:59.000Z

265

Layered Atom Arrangements in Complex Materials  

Science Conference Proceedings (OSTI)

In this report, we develop an atom layer stacking model to describe systematically the crystal structures of complex materials. To illustrate the concepts, we consider a sequence of oxide compounds in which the metal cations progress in oxidation state from monovalent (M{sup 1+}) to tetravalent (M{sup 4+}). We use concepts relating to geometric subdivisions of a triangular atom net to describe the layered atom patterns in these compounds (concepts originally proposed by Shuichi Iida). We demonstrate that as a function of increasing oxidation state (from M{sup 1+} to M{sup 4+}), the layer stacking motifs used to generate each successive structure (specifically, motifs along a 3 symmetry axis), progress through the following sequence: MMO, MO, M{sub r}O, MO{sub r/s}O{sub u/v}, MOO (where M and O represent fully dense triangular atom nets and r/s and u/v are fractions used to describe partially filled triangular atom nets). We also develop complete crystallographic descriptions for the compounds in our oxidation sequence using trigonal space group R{bar 3}.

K.E. Sikafus; R.W.Grimes; S.M.Corish; A.R. Cleave; M.Tang; C.R.Stanek; B.P. Uberuaga; J.A.Valdez

2005-04-15T23:59:59.000Z

266

Method and apparatus for atomic imaging  

SciTech Connect

A method and apparatus for three dimensional imaging of the atomic environment of disordered adsorbate atoms are disclosed. The method includes detecting and measuring the intensity of a diffuse low energy electron diffraction pattern formed by directing a beam of low energy electrons against the surface of a crystal. Data corresponding to reconstructed amplitudes of a wave form is generated by operating on the intensity data. The data corresponding to the reconstructed amplitudes is capable of being displayed as a three dimensional image of an adsorbate atom. The apparatus includes a source of a beam of low energy electrons and a detector for detecting the intensity distribution of a DLEED pattern formed at the detector when the beam of low energy electrons is directed onto the surface of a crystal. A device responsive to the intensity distribution generates a signal corresponding to the distribution which represents a reconstructed amplitude of a wave form and is capable of being converted into a three dimensional image of the atomic environment of an adsorbate atom on the crystal surface.

Saldin, Dilano K. (Milwaukee, WI); de Andres Rodriquez, Pedro L. (Madrid, ES)

1993-01-01T23:59:59.000Z

267

85More Atomic Fractions The single electron inside an atom can exist in many  

E-Print Network (OSTI)

85More Atomic Fractions The single electron inside an atom can exist in many different energy states. The lowest energy an electron can have is called the Ground State: this is the bottom rung on the ladder marked with an energy of '1' in the figure to the left. The electron must obey the Ladder Rule

268

Atomic Scale Characterization of Compound Semiconductors using Atom Probe Tomography: Preprint  

DOE Green Energy (OSTI)

Internal interfaces are critical in determining the performance of III-V multijunction solar cells. Studying these interfaces with atomic resolution using a combination of transmission electron microscopy (TEM), atom probe tomography (APT), and density functional calculations enables a more fundamental understanding of carrier dynamics in photovoltaic (PV) device structures. To achieve full atomic scale spatial and chemical resolution, data acquisition parameters in laser pulsed APT must be carefully studied to eliminate surface diffusion. Atom probe data with minimized group V ion clustering and expected stoichiometry can be achieved by adjusting laser pulse power, pulse repetition rate, and specimen preparation parameters such that heat flow away from the evaporating surface is maximized. Applying these improved analysis conditions to III-V based PV gives an atomic scale understanding of compositional and dopant profiles across interfaces and tunnel junctions and the initial stages of alloy clustering and dopant accumulation. Details on APT experimental methods and future in-situ instrumentation developments are illustrated.

Gorman, B. P.; Guthrey, H.; Norman, A. G.; Al-Jassim, M.; Lawrence, D.; Prosa, T.

2011-07-01T23:59:59.000Z

269

Spectroscopy and atomic force microscopy of biomass  

NLE Websites -- All DOE Office Websites (Extended Search)

Spectroscopy Spectroscopy and atomic force microscopy of biomass L. Tetard a,b , A. Passian a,b,n , R.H. Farahi a , U.C. Kalluri c , B.H. Davison c , T. Thundat a,b a Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA b Department of Physics, University of Tennessee, Knoxville, TN 37996, USA c Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA a r t i c l e i n f o Keywords: Atomic force microscopy Spectroscopy Plant cells Biomass Nanomechanics a b s t r a c t Scanning probe microscopy has emerged as a powerful approach to a broader understanding of the molecular architecture of cell walls, which may shed light on the challenge of efficient cellulosic ethanol production. We have obtained preliminary images of both Populus and switchgrass samples using atomic force microscopy (AFM). The results show distinctive features that are shared by switchgrass

270

Detecting Topological Phases in Cold Atoms  

E-Print Network (OSTI)

Chern insulators are band insulators which exhibit a gap in the bulk and gapless excitations in the edge. Detection of Chern insulators is a serious challenge in cold atoms since the Hall transport measurements are technically unrealistic for neutral atoms. By establishing a natural correspondence between the time-reversal invariant topological insulator and quantum anomalous Hall system, we show for a class of Chern insulators that the topology can be determined by only measuring Bloch eigenstates at highly symmetric points of the Brillouin zone (BZ). Furthermore, we introduce two experimental schemes including the spin-resolved Bloch oscillation to carry out the measurement. These schemes are highly feasible under realistic experimental conditions. Our results may provide a powerful tool to detect topological phases in cold atoms.

Xiong-Jun Liu; K. T. Law; T. K. Ng; Patrick A. Lee

2013-06-21T23:59:59.000Z

271

Atomic multipole relaxation rates near surfaces  

E-Print Network (OSTI)

The spontaneous relaxation rates for an atom in free space and close to an absorbing surface are calculated to various orders of the electromagnetic multipole expansion. The spontaneous decay rates for dipole, quadrupole and octupole transitions are calculated in terms of their respective primitive electric multipole moments and the magnetic relaxation rate is calculated for the dipole and quadrupole transitions in terms of their respective primitive magnetic multipole moments. The theory of electromagnetic field quantization in magnetoelectric materials is used to derive general expressions for the decay rates in terms of the dyadic Green function. We focus on the decay rates in free space and near an infinite half space. For the decay of atoms near to an absorbing dielectric surface we find a hierarchy of scaling laws depending on the atom-surface distance z.

Crosse, J A

2009-01-01T23:59:59.000Z

272

Atomic multipole relaxation rates near surfaces  

E-Print Network (OSTI)

The spontaneous relaxation rates for an atom in free space and close to an absorbing surface are calculated to various orders of the electromagnetic multipole expansion. The spontaneous decay rates for dipole, quadrupole and octupole transitions are calculated in terms of their respective primitive electric multipole moments and the magnetic relaxation rate is calculated for the dipole and quadrupole transitions in terms of their respective primitive magnetic multipole moments. The theory of electromagnetic field quantization in magnetoelectric materials is used to derive general expressions for the decay rates in terms of the dyadic Green function. We focus on the decay rates in free space and near an infinite half space. For the decay of atoms near to an absorbing dielectric surface we find a hierarchy of scaling laws depending on the atom-surface distance z.

J. A. Crosse; Stefan Scheel

2009-01-20T23:59:59.000Z

273

Atomic hydrogen cleaning of semiconductor photocathodes  

DOE Green Energy (OSTI)

Negative Electron Affinity (NEA) semiconductor photocathodes are widely used for the production of polarized electron beams, and are also useful for the production of high brightness electron beams which can be modulated at very high frequencies. Preparation of an atomically clean semiconductor surface is an essential step in the fabrication of a NEA photocathode. This cleaning step is difficult for certain semiconductors, such as the very thin materials which produce the highest beam polarization, and those which have tightly bound oxides and carbides. Using a small RF dissociation atomic hydrogen source, the authors have reproducibly cleaned GaAs wafers which have been only degreased prior to installation in vacuum. They have consistently prepared very high quantum efficiency photocathodes following atomic hydrogen cleaning. Details of their apparatus and most recent results are presented.

Sinclair, C.K.; Poelker, B.M.; Price, J.S. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

1997-06-01T23:59:59.000Z

274

FUNDAMENTAL STUDY OF THE ATOMIC BATTERY  

SciTech Connect

Electron-voltaic effects in diffased p-n junctions of Ge were obtained by diffusing As at 210 deg C in 10/sup -5/ Hg vacuum on a p-type Ge, doped with In, of 3 OMEGA /cm resistivity. A thin Au wire was attached to the surface of this junction by soldering. The p-n junction was irradiated with a 50mc Sr/sup 90/-Y/sup 90/ source, and the electron-voltaic effect was measured from room temperature down to -78 deg C. The general condition of an atomic battery was similar to that of a solar battery except that the atomic battery offers the possibility of current multiplication but presents the problem of radiation damage in the crystal lattice. At room temperature no radiation damage was observed. The junction and radiation damage of a Si-based atomic battery was also studied. (OID)

Yamanaka, C.; Wada, H.; Yamamura, Y.

1958-10-01T23:59:59.000Z

275

Atomic physics of strongly correlated systems  

DOE Green Energy (OSTI)

This report presents the progress made in our continuing study of strongly correlated atomic systems within the last year. We have examined the shape of three-body systems in hyperspherical coordinates by studying the evolution of the density functions with the mass ratio of the particles in the system. We have calculated the ejected electron spectra from the autoionizing states formed in double capture processes in collisions of multiply charged ions with atoms. We have investigated the systematics and the propensity rules of radiative and Auger decay rates of high-lying doubly excited states. We have also studied ion-atom collisions for processes which pose great challenges to detailed theories, by looking into processes where the cross sections are small such as the excitation process in He{sup ++} + H collisions, or by looking into fine details such as the orientation parameters in excitation and charge transfer processes.

Lin, Chii-Dong.

1992-01-01T23:59:59.000Z

276

Kaonic Atom X?ray Spectra  

Science Conference Proceedings (OSTI)

In kaonic atoms energy displacement and broadening of states result from the strong interaction. The most simple kaonic atoms like kaonic hydrogen and deuterium open the possibility to measure this strong interaction induced shift and width by x?ray spectroscopy. In the SIDDHARTA experiment al LNF (Frascati) the DA?NE electron?positron collider delivers nearly mono?energetic negatively charged kaons from ? meson decay. This unique kaon source is used to form kaonic atoms. New high performance x?ray detectors (silicon drift detectors) arranged in an array allow x?ray spectroscopy with high energy resolution combined with timing capability. High precision x?ray measurements like SIDDHARTA at LNF will open the way to study the low energy regime of the strong force in the antikaon?nucleon interaction. The experiment and its current status is presented in this talk.

J. Marton; on behalf of the SIDDHARTA Collaboration

2009-01-01T23:59:59.000Z

277

First Attempts at Antihydrogen Trapping in ALPHA  

SciTech Connect

The ALPHA apparatus is designed to produce and trap antihydrogen atoms. The device comprises a multifunction Penning trap and a superconducting, neutral atom trap having a minimum-B configuration. The atom trap features an octupole magnet for transverse confinement and solenoidal mirror coils for longitudinal confinement. The magnetic trap employs a fast shutdown system to maximize the probability of detecting the annihilation of released antihydrogen. In this article we describe the first attempts to observe antihydrogen trapping.

Andresen, G. B.; Bowe, P. D.; Hangst, J. S. [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark); Bertsche, W.; Butler, E.; Charlton, M.; Humphries, A. J.; Jenkins, M. J.; Joergensen, L. V.; Madsen, N.; Werf, D. P. van der [Department of Physics, Swansea University, Swansea SA2 8PP (United Kingdom); Bray, C. C.; Chapman, S.; Fajans, J.; Povilus, A.; Wurtele, J. S. [Department of Physics, University of California at Berkeley, Berkeley, CA 94720-7300 (United States); Cesar, C. L.; Lambo, R.; Silveira, D. M. [Instituto de Fisica Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972 (Brazil); Fujiwara, M. C. [TRIUMF, 4004 Wesbrook Mall, Vancouver BC, V6T 2A3 (Canada)] (and others)

2008-08-08T23:59:59.000Z

278

Atomic-level imaging, processing and characterization of semiconductor surfaces  

DOE Patents (OSTI)

A method for selecting and removing single specific atoms from a solid material surface uses photon biasing to break down bonds that hold the selected atom in the lattice and to reduce barrier effects that hold the atom from transferring to a probe. The photon bias is preferably light or other electromagnetic radiation with a wavelength and frequency that approximately matches the wave function of the target atom species to be removed to induce high energy, selective thermionic-like vibration. An electric field potential is then applied between the probe and the surface of the solid material to pull the atom out of the lattice and to transfer the atom to the probe. Different extrinsic atoms can be installed in the lattice sites that are vacated by the removed atoms by using a photon bias that resonates the extrinsic atom species, reversing polarity of the electric field, and blowing gas comprising the extrinsic atoms through a hollow catheter probe.

Kazmerski, Lawrence L. (Lakewood, CO)

1995-01-01T23:59:59.000Z

279

Atomic-level imaging, processing and characterization of semiconductor surfaces  

DOE Patents (OSTI)

A method for selecting and removing single specific atoms from a solid material surface uses photon biasing to break down bonds that hold the selected atom in the lattice and to reduce barrier effects that hold the atom from transferring to a probe. The photon bias is preferably light or other electromagnetic radiation with a wavelength and frequency that approximately matches the wave function of the target atom species to be removed to induce high energy, selective thermionic-like vibration. An electric field potential is then applied between the probe and the surface of the solid material to pull the atom out of the lattice and to transfer the atom to the probe. Different extrinsic atoms can be installed in the lattice sites that are vacated by the removed atoms by using a photon bias that resonates the extrinsic atom species, reversing polarity of the electric field, and blowing gas comprising the extrinsic atoms through a hollow catheter probe. 8 figs.

Kazmerski, L.L.

1995-08-22T23:59:59.000Z

280

Isolating and moving single atoms using silicon nanocrystals  

DOE Patents (OSTI)

A method is disclosed for isolating single atoms of an atomic species of interest by locating the atoms within silicon nanocrystals. This can be done by implanting, on the average, a single atom of the atomic species of interest into each nanocrystal, and then measuring an electrical charge distribution on the nanocrystals with scanning capacitance microscopy (SCM) or electrostatic force microscopy (EFM) to identify and select those nanocrystals having exactly one atom of the atomic species of interest therein. The nanocrystals with the single atom of the atomic species of interest therein can be sorted and moved using an atomic force microscope (AFM) tip. The method is useful for forming nanoscale electronic and optical devices including quantum computers and single-photon light sources.

Carroll, Malcolm S. (Albuquerque, NM)

2010-09-07T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Cavity Loss Induced Generation of Entangled Atoms  

E-Print Network (OSTI)

We discuss the generation of entangled states of two two-level atoms inside an optical resonator. When the cavity decay is continuously monitored, the absence of photon-counts is associated with the presence of an atomic entangled state. In addition to being conceptually simple, this scheme could be demonstrated with presently available technology. We describe how such a state is generated through conditional dynamics, using quantum jump methods, including both cavity damping and spontaneous emission decay, and evaluate the fidelity and relative entropy of entanglement of the generated state compared with the target entangled state.

M. B. Plenio; S. F. Huelga; A. Beige; P. L. Knight

1998-11-02T23:59:59.000Z

282

Cavity Loss Induced Generation of Entangled Atoms  

E-Print Network (OSTI)

We discuss the generation of entangled states of two two-level atoms inside an optical resonator. When the cavity decay is continuously monitored, the absence of photon-counts is associated with the presence of an atomic entangled state. In addition to being conceptually simple, this scheme could be demonstrated with presently available technology. We describe how such a state is generated through conditional dynamics, using quantum jump methods, including both cavity damping and spontaneous emission decay, and evaluate the fidelity and relative entropy of entanglement of the generated state compared with the target entangled state.

Plenio, M B; Beige, A; Knight, P L

1999-01-01T23:59:59.000Z

283

Nuclear medium effects from hadronic atoms  

E-Print Network (OSTI)

The state of the art in the study of pionic, kaonic and Sigmionic atoms, along with the in-medium nuclear interactions deduced for these hadrons, is reviewed. A special emphasis is placed on recent developments in antikaon-nuclear physics, where a strongly attractive density dependent antikaon-nuclear potential of order 150-200 MeV in nuclear matter emerges by fitting K^- atom data. This has interesting repercussions on antikaon quasibound nuclear states, on the composition of strange hadronic matter and on kaon condensation in self bound hadronic systems.

Friedman, E

2011-01-01T23:59:59.000Z

284

The ORNL Controlled Fusion Atomic Data Center  

SciTech Connect

The principal mission of the Controlled Fusion Atomic Data Center is the collection evaluation, and dissemination of atomic collision data relevant to fusion energy development. With the advent of the widespread use of the World Wide Web, the data center`s resources are being placed on-line to facilitate their use by end-users (cf. http://www-cfadc.phy.ornl.gov/). As this development continues, initially disparate, individually compiled resources will be transformed into integrated tools for retrieving recommended data, or displaying and manipulating the information available. The data center`s present capabilities, recent data production/evaluation efforts, and goals for future development are highlighted here.

Schultz, D.R.; Krstic, P.S.; Ownby, F.M.; Meyer, F.W.; Havener, C.C.; Bannister, M.E.; Liu, W.; Jeffery, D.J.; Stancil, P.C. [Oak Ridge National Lab., TN (United States). Physics Div.

1997-12-31T23:59:59.000Z

285

Atomic power in space: A history  

Science Conference Proceedings (OSTI)

''Atomic Power in Space,'' a history of the Space Isotope Power Program of the United States, covers the period from the program's inception in the mid-1950s through 1982. Written in non-technical language, the history is addressed to both the general public and those more specialized in nuclear and space technologies. 19 figs., 3 tabs.

Not Available

1987-03-01T23:59:59.000Z

286

Atomic physics with highly charged ions  

SciTech Connect

This report discusses: One electron outer shell processes in fast ion-atom collisions; role of electron-electron interaction in two-electron processes; multi-electron processes at low energy; multi-electron processes at high energy; inner shell processes; molecular fragmentation studies; theory; and, JRM laboratory operations.

Richard, P.

1991-08-01T23:59:59.000Z

287

Atomic clocks with suppressed blackbody radiation shift  

E-Print Network (OSTI)

We develop a nonstandard concept of atomic clocks where the blackbody radiation shift (BBRS) and its temperature fluctuations can be dramatically suppressed (by one to three orders of magnitude) independent of the environmental temperature. The suppression is based on the fact that in a system with two accessible clock transitions (with frequencies $\

Yudin, V I; Okhapkin, M V; Bagayev, S N; Tamm, Chr; Peik, E; Huntemann, N; Mehlstaubler, T E; Riehle, F

2011-01-01T23:59:59.000Z

288

The New Element Curium (Atomic Number 96)  

DOE R&D Accomplishments (OSTI)

Two isotopes of the element with atomic number 96 have been produced by the helium-ion bombardment of plutonium. The name curium, symbol Cm, is proposed for element 96. The chemical experiments indicate that the most stable oxidation state of curium is the III state.

Seaborg, G. T.; James, R. A.; Ghiorso, A.

1948-00-00T23:59:59.000Z

289

Nano-soldering to single atomic layer  

DOE Patents (OSTI)

A simple technique to solder submicron sized, ohmic contacts to nanostructures has been disclosed. The technique has several advantages over standard electron beam lithography methods, which are complex, costly, and can contaminate samples. To demonstrate the soldering technique graphene, a single atomic layer of carbon, has been contacted, and low- and high-field electronic transport properties have been measured.

Girit, Caglar O. (Berkeley, CA); Zettl, Alexander K. (Kensington, CA)

2011-10-11T23:59:59.000Z

290

Entangling strings of neutral atoms in 1D atomic pipeline structures  

E-Print Network (OSTI)

We study a string of neutral atoms with nearest neighbor interaction in a 1D beam splitter configuration, where the longitudinal motion is controlled by a moving optical lattice potential. The dynamics of the atoms crossing the beam splitter maps to a 1D spin model with controllable time dependent parameters, which allows the creation of maximally entangled states of atoms by crossing a quantum phase transition. Furthermore, we show that this system realizes protected quantum memory, and we discuss the implementation of one- and two-qubit gates in this setup.

U. Dorner; P. Fedichev; D. Jaksch; M. Lewenstein; P. Zoller

2002-12-06T23:59:59.000Z

291

Molecular Beam Studies of Hot Atom Chemical Reactions: Reactive Scattering of Energetic Deuterium Atoms  

DOE R&D Accomplishments (OSTI)

A brief review of the application of the crossed molecular beams technique to the study of hot atom chemical reactions in the last twenty years is given. Specific emphasis is placed on recent advances in the use of photolytically produced energetic deuterium atoms in the study of the fundamental elementary reactions D + H{sub 2} -> DH + H and the substitution reaction D + C{sub 2}H{sub 2} -> C{sub 2}HD + H. Recent advances in uv laser and pulsed molecular beam techniques have made the detailed study of hydrogen atom reactions under single collision conditions possible.

Continetti, R. E.; Balko, B. A.; Lee, Y. T.

1989-02-00T23:59:59.000Z

292

Molecular beam studies of hot atom chemical reactions: Reactive scattering of energetic deuterium atoms  

DOE Green Energy (OSTI)

A brief review of the application of the crossed molecular beams technique to the study of hot atom chemical reactions in the last twenty years is given. Specific emphasis is placed on recent advances in the use of photolytically produced energetic deuterium atoms in the study of the fundamental elementary reactions D + H/sub 2/ /minus/> DH + H and the substitution reaction D + C/sub 2/H/sub 2/ /minus/> C/sub 2/HD + H. Recent advances in uv laser and pulsed molecular beam techniques have made the detailed study of hydrogen atom reactions under single collision conditions possible. 18 refs., 9 figs.

Continetti, R.E.; Balko, B.A.; Lee, Y.T.

1989-02-01T23:59:59.000Z

293

Direct measurement of concurrence for atomic two-qubit pure states  

Science Conference Proceedings (OSTI)

We propose a general scheme to measure the concurrence of an arbitrary two-qubit pure state in atomic systems. The protocol is based on one- and two-qubit operations acting on two available copies of the bipartite system, and followed by a global qubit readout. We show that it is possible to encode the concurrence in the probability of finding all atomic qubits in the ground state. Two possible scenarios are considered: atoms crossing three-dimensional microwave cavities and trapped ion systems.

Romero, G.; Lopez, C. E.; Lastra, F.; Retamal, J. C. [Departamento de Fisica, Universidad de Santiago de Chile, Casilla 307 Correo 2, Santiago (Chile); Solano, E. [Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universitaet, Theresienstrasse 37, D-80333 Munich (Germany); Seccion Fisica, Departamento de Ciencias, Pontificia Universidad Catolica del Peru, Apartado 1761, Lima (Peru)

2007-03-15T23:59:59.000Z

294

Rydberg atom detection of the temporal coherence of cosmic microwave background radiation  

E-Print Network (OSTI)

Rydberg atoms immersed in cold blackbody radiation are shown to display long-lived quantum coherence effects on timescales of tens of picoseconds. By solving non-Markovian equations of motion with no free parameters we obtain the time evolution of the density matrix, and demonstrate that the blackbody-induced temporal coherences manifest as quantum beats in time-resolved fluorescence intensities of the Rydberg atoms. A measurable fluorescence signal can be obtained with a cold trapped ensemble of 1e8 Rydberg atoms subject to 2.7 K cosmic microwave background radiation (CMB), allowing for novel insights into previously unexamined quantum coherence properties of CMB.

Tscherbul, Timur V

2013-01-01T23:59:59.000Z

295

Rydberg atom detection of the temporal coherence of cosmic microwave background radiation  

E-Print Network (OSTI)

Rydberg atoms immersed in cold blackbody radiation are shown to display long-lived quantum coherence effects on timescales of tens of picoseconds. By solving non-Markovian equations of motion with no free parameters we obtain the time evolution of the density matrix, and demonstrate that the blackbody-induced temporal coherences manifest as decaying quantum beats in time-resolved fluorescence intensities of the Rydberg atoms. A measurable fluorescence signal can be obtained with a cold trapped ensemble of 10^8 Rydberg atoms subject to suitably amplified cosmic microwave background radiation (CMB) at 2.7 K, allowing for novel insights into previously unexamined quantum coherence properties of CMB.

Timur V. Tscherbul; Paul Brumer

2013-05-23T23:59:59.000Z

296

Manhattan Project: Exploring the Atom, 1919-1932  

Office of Scientific and Technical Information (OSTI)

Ernest Rutherford (and James Chadwick, on the far right) EXPLORING THE ATOM Ernest Rutherford (and James Chadwick, on the far right) EXPLORING THE ATOM (1919-1932) Events > Atomic Discoveries, 1890s-1939 A Miniature Solar System, 1890s-1919 Exploring the Atom, 1919-1932 Atomic Bombardment, 1932-1938 The Discovery of Fission, 1938-1939 Fission Comes to America, 1939 The road to the atomic bomb began in earnest in 1919 with the first artificial transmutation of an element. The New Zealander Ernest Rutherford, working in the Cavendish Laboratory at Cambridge University in England, changed several atoms of nitrogen into oxygen. The final addition to the atomic "miniature solar system" first proposed by Niels Bohr came in 1932 when James Chadwick, Rutherford's colleague at Cambridge, identified the third and final basic particle of the atom: the neutron.

297

Reactive gas atomization processing for Fe-based ODS alloys  

SciTech Connect

Gas atomization reaction synthesis was employed as a simplified method for processing oxide dispersion forming precursor Fe-based powders (e.g., FeCrYHf). During this process a reactive atomization gas (i.e., ArO2) was used to oxidize the powder surfaces during primary break-up and rapid solidification of the molten alloy. This resulted in envelopment of the powders by an ultra-thin (t < 50 nm) metastable Cr-enriched oxide shell that was used as a vehicle to transport oxygen into the consolidated microstructure. Subsequent elevated temperature heat treatment promoted thermodynamically driven oxygen exchange reactions between trapped films of Cr-enriched oxide and internal (Y, Hf)-enriched intermetallic precipitates, resulting in highly stable nano-metric mixed oxide dispersoids (i.e., YHfO) that were identified with X-ray diffraction. Transmission electron microscopy and atom probe tomography results also revealed that the size and distribution of the dispersoids were found to depend strongly on the original rapidly solidified microstructure. To exploit this, several oxide dispersion strengthened microstructures were engineered from different powder particle size ranges, illustrating microstructural control as a function of particle solidification rate. Additionally, preliminary thermalmechanical processing was used to develop a fine scale dislocation substructure for ultimate strengthening of the alloy.

Rieken, Joel R [Ames Laboratory; Anderson, Iver E [Ames Laboratory; Kramer, Matthew J [Ames Laboratory; Odette, G R [University of California; Stergar, E [University of California; Haney, E [University of California

2011-08-24T23:59:59.000Z

298

Quantization of Differences Between Atomic and Nuclear Rest Masses and Selforganization of Atoms and Nuclei  

E-Print Network (OSTI)

We come to the conclusion that all atomic models based on either the Newton equation and the Kepler laws, or the Maxwell equations, or the Schrodinger and Dirac equations are in reasonable agreement with experimental data. We can only suspect that these equations are grounded on the same fundamental principle(s) which is (are) not known or these equations can be transformed into each other. We proposed a new mechanism of LENR: cooperative processes in the whole system - nuclei+atoms+condensed matter - nuclear reactions in plasma - can occur at smaller threshold energies than the corresponding ones on free constituents. We were able to quantize phenomenologically the first time the differences between atomic and nuclear rest masses by the formula (in MeV/$c^{2}$) $\\Delta M=\\frac{n_{1}}{n_{2}}*0.0076294, n_{i}=1,2,3,...$ Note that this quantization rule is justified for atoms and nuclei with different $A, N$ and $Z$ and the nuclei and atoms represent a coherent synchronized systems - a complex of coupled oscillators (resonators). The cooperative resonance synchronization mechanisms are responsible for explanation of how the electron volt world can influence the nuclear mega electron volt world. It means that we created new possibilities for inducing and controlling nuclear reactions by atomic processes.

F. A. Gareev; I. E. Zhidkova

2006-09-30T23:59:59.000Z

299

Distribution Category: Atomic, Molecular, and Chemical Physics  

NLE Websites -- All DOE Office Websites (Extended Search)

Atomic, Atomic, Molecular, and Chemical Physics (UC-411) ARGONNE NATIONAL LABORATORY 9700 South Cass Avenue Argonne, TIlinois 60439 ANLI APSILS-151 RESULTS OF DESIGN CALCULATIONS FOR THE MODULATOR OF THE CROSSED FIELD UNDULATOR DEVICE by Roland S8:voy Advanced Photon Source August 1990 Work sponsored by ~--~,P:a7te~n7t~C~le-.a-re-d--b\-!------ Pen"" .... + D - CII, epartrnent, AND R':-lr-!, ("'1:' ' "'"",,, l... ,r:.. ,'\')k. . f\UTHOF?IZED BY 1l;J6r1l11Cal Publications Ser " O(;ite~ ~ 'vjces Technicallnf ~avld R .* ·i;;~rln - ormatIon Services, ANL Uo So DEPARTMENT OF ENERGY Office of Energy Research 1 Abstract: The modulator in the crossed field undulator device is used to shift the

300

Dosimetry of the Atomic Bomb Survivors  

Science Conference Proceedings (OSTI)

A brief account of the presentations and discussions at the Late Effects Workshop on Dosimetry of the Atomic Bomb Survivors held in conjunction with the 29th Annual Meeting of the Radiation Reserch Society in Minneapolis, MN, on May 32, 1981 is presented. The following five papers are briefly reviewed: 1)Radiobiological significance of the Hiroshima/Nagasaki data by V.P. Bond; 2)Revised Dose Estimates at Hiroshima and Nagasaki, by W.E. Loewe; 3)Review of dosimetry for the Japanese atomic bomb survivors by G.D. Kerr; 4)Ichiban: numberoriginal studies, by J. Auxier; and 5)NCRP's involvement in the Hiroshima and Nagasaki Dosimetry, by H.O. Wyckoff. (JMT)

Sinclair, W.K. (National Council on Radiation Protection and Measurements, Washington, DC); Failla, P.

1981-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Atomic Polarization and the Hanle Effect  

E-Print Network (OSTI)

This article presents an introduction to optical pumping, atomic polarization and the Hanle effect in weakly magnetized stellar atmospheres. Although the physical processes and the theoretical framework described here are of interest for applications in a variety of astrophysical contexts (e.g. scattering polarization in circumstellar envelopes and polarization in astronomical masers), the article focuses mainly on the quest for understanding the physical origin of the linearly polarized solar limb spectrum. It considers also the development of the Hanle effect as a reliable diagnostic tool for making feasible new advances in solar photospheric and chromospheric magnetism. Particular emphasis is given to a rigorous modeling of polarization phenomena as the essential link between theory and observations. Some of the most recent advances in this field are presented after carefully explaining how the various radiation pumping mechanisms lead to atomic polarization in the absence and in the presence of weak magnetic fields.

Javier Trujillo-Bueno

2002-02-18T23:59:59.000Z

302

Hydrogen atom in Palatini theories of gravity  

E-Print Network (OSTI)

We study the effects that the gravitational interaction of $f(R)$ theories of gravity in Palatini formalism has on the stationary states of the Hydrogen atom. We show that the role of gravity in this system is very important for lagrangians $f(R)$ with terms that grow at low curvatures, which have been proposed to explain the accelerated expansion rate of the universe. We find that new gravitationally induced terms in the atomic Hamiltonian generate a strong backreaction that is incompatible with the very existence of bound states. In fact, in the 1/R model, Hydrogen disintegrates in less than two hours. The universe that we observe is, therefore, incompatible with that kind of gravitational interaction. Lagrangians with high curvature corrections do not lead to such instabilities.

Gonzalo J. Olmo

2008-02-27T23:59:59.000Z

303

Atomization methods for forming magnet powders  

SciTech Connect

The invention encompasses methods of utilizing atomization, methods for forming magnet powders, methods for forming magnets, and methods for forming bonded magnets. The invention further encompasses methods for simulating atomization conditions. In one aspect, the invention includes an atomization method for forming a magnet powder comprising: a) forming a melt comprising R.sub.2.1 Q.sub.13.9 B.sub.1, Z and X, wherein R is a rare earth element; X is an element selected from the group consisting of carbon, nitrogen, oxygen and mixtures thereof; Q is an element selected from the group consisting of Fe, Co and mixtures thereof; and Z is an element selected from the group consisting of Ti, Zr, Hf and mixtures thereof; b) atomizing the melt to form generally spherical alloy powder granules having an internal structure comprising at least one of a substantially amorphous phase or a substantially nanocrystalline phase; and c) heat treating the alloy powder to increase an energy product of the alloy powder; after the heat treatment, the alloy powder comprising an energy product of at least 10 MGOe. In another aspect, the invention includes a magnet comprising R, Q, B, Z and X, wherein R is a rare earth element; X is an element selected from the group consisting of carbon, nitrogen, oxygen and mixtures thereof; Q is an element selected from the group consisting of Fe, Co and mixtures thereof; and Z is an element selected from the group consisting of Ti, Zr, Hf and mixtures thereof; the magnet comprising an internal structure comprising R.sub.2.1 Q.sub.13.9 B.sub.1.

Sellers, Charles H. (Idaho Falls, ID); Branagan, Daniel J. (Idaho Falls, ID); Hyde, Timothy A. (Idaho Falls, ID)

2000-01-01T23:59:59.000Z

304

Atomic Power in Space: A History  

DOE R&D Accomplishments (OSTI)

"Atomic Power in Space," a history of the Space Isotope Power Program of the United States, covers the period from the program's inception in the mid-1950s through 1982. Written in non-technical language, the history is addressed to both the general public and those more specialized in nuclear and space technologies. Interplanetary space exploration successes and achievements have been made possible by this technology, for which there is no known substitue.

1987-03-00T23:59:59.000Z

305

ZAPP: Z-pinch atomic physics program  

SciTech Connect

High-density and high-temperature plasmas have been produced in a z-pinch with a hollow gas puff. A number of interesting atomic-physics phenomena occur in these plasmas and some of these phenomena provide important diagnostic information for characterizing the plasmas. We have been interested in collisions of high-energy electrons with highly stripped ions in these plasmas. Such collisions may produce a population inversion which could result in stimulated emission in the x-ray regime.

Reed, K.

1983-01-07T23:59:59.000Z

306

Bipartite entanglement purification with neutral atoms  

E-Print Network (OSTI)

We theoretically study bipartite entanglement purification with neutral atoms via cavity-assistant interaction and linear optical elements. We focus on entanglement distillation and the recurrence protocol, whose performances under idealized and realistic conditions are discussed. The implementation of these purification protocols has been tested with numerical simulations. We analyze the performance and stability of all required operations and emphasize that all techniques are feasible with current experimental technology.

Xue, P

2008-01-01T23:59:59.000Z

307

Bipartite entanglement purification with neutral atoms  

E-Print Network (OSTI)

We theoretically study bipartite entanglement purification with neutral atoms via cavity-assistant interaction and linear optical elements. We focus on entanglement distillation and the recurrence protocol, whose performances under idealized and realistic conditions are discussed. The implementation of these purification protocols has been tested with numerical simulations. We analyze the performance and stability of all required operations and emphasize that all techniques are feasible with current experimental technology.

P. Xue; X. -F. Zhou

2008-09-04T23:59:59.000Z

308

First AID (Atom counting for Isotopic Determination).  

SciTech Connect

Los Alamos National Laboratory (LANL) has established an in vitro bioassay monitoring program in compliance with the requirements in the Code of Federal Regulations, 10 CFR 835, Occupational Radiation Protection. One aspect of this program involves monitoring plutonium levels in at-risk workers. High-risk workers are monitored using the ultra-sensitive Therrnal Ionization Mass Spectrometry (TIMS) technique to ensure compliance with DOE standards. TIMS is used to measure atom ratios of 239Pua nd 240Puw ith respect to a tracer isotope ('Pu). These ratios are then used to calculate the amount of 239Pu and 240Pup resent. This low-level atom counting technique allows the calculation of the concentration levels of 239Pu and 240Pu in urine for at risk workers. From these concentration levels, dose assessments can be made and worker exposure levels can be monitored. Detection limits for TIMS analysis are on the order of millions of atoms, which translates to activity levels of 150 aCi 239Pua nd 500 aCi for 240Pu. pCi for Our poster presentation will discuss the ultra-sensitive, low-level analytical technique used to measure plutonium isotopes and the data verification methods used for validating isotopic measurements.

Roach, J. L. (Jeffrey L.); Israel, K. M. (Kimberly M.); Steiner, R. E. (Robert E.); Duffy, C. J. (Clarence J.); Roench, F. R. (Fred R.)

2002-01-01T23:59:59.000Z

309

Atomic Inference from Weak Gravitational Lensing Data  

SciTech Connect

We present a novel approach to reconstructing the projected mass distribution from the sparse and noisy weak gravitational lensing shear data. The reconstructions are regularized via the knowledge gained from numerical simulations of clusters, with trial mass distributions constructed from n NFW profile ellipsoidal components. The parameters of these ''atoms'' are distributed a priori as in the simulated clusters. Sampling the mass distributions from the atom parameter probability density function allows estimates of the properties of the mass distribution to be generated, with error bars. The appropriate number of atoms is inferred from the data itself via the Bayesian evidence, and is typically found to be small, reecting the quality of the data. Ensemble average mass maps are found to be robust to the details of the noise realization, and succeed in recovering the demonstration input mass distribution (from a realistic simulated cluster) over a wide range of scales. As an application of such a reliable mapping algorithm, we comment on the residuals of the reconstruction and the implications for predicting convergence and shear at specific points on the sky.

Marshall, Phil; /KIPAC, Menlo Park

2005-12-14T23:59:59.000Z

310

OpenPA: Open Portable Atomics | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

(Open Portable Atomics) is an open source library intended to provide a consistent C API for performing atomic operations on a variety of platforms. The main goal of the...

311

Contributions of Atom Probe Tomography to the Understanding of ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Since the introduction of the computer-controlled atom probe field ion ... to the understanding of steels have been made primarily due to its near atomic ... of the Microstructure-Property-Processing Relationships in a Series of...

312

Imaging Lithium Atoms at Sub-Angstrom Resolution  

E-Print Network (OSTI)

110] orientation for LiCoO 2 without lithium atoms ( upper)and with lithium atoms (lower). Images are simulated at 0.9Horn LBNL-56646 resolution of lithium ions in LiCoO 2 . Fall

O'Keefe, Michael A.; Shao-Horn, Yang

2005-01-01T23:59:59.000Z

313

Hybrid approaches to quantum information using ions, atoms and photons  

E-Print Network (OSTI)

This thesis presents two hybrid systems for quantum information processing - one joining cold ions and cold atoms and another coupling linear chains of atomic ions with photons via an optical resonator. The first experimental ...

Cetina, Marko, Ph. D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

314

Squeezing collective atomic spins with an optical resonator  

E-Print Network (OSTI)

This thesis describes two methods of overcoming the standard quantum limit of signal-to-noise ratio in atomic precision measurements. In both methods, the interaction between an ultracold atomic ensemble and an optical ...

Leroux, Ian Daniel

2011-01-01T23:59:59.000Z

315

Mercury Atomic Clock Sets Time-Keeping Record  

Science Conference Proceedings (OSTI)

Mercury Atomic Clock Sets Time-Keeping Record. ... A prototype mercury optical clock originally was demonstrated at NIST in 2000. ...

2013-08-27T23:59:59.000Z

316

NIST: Mercury, Atomic Ref. Data for Elect. Struct. Calc.  

Science Conference Proceedings (OSTI)

Table of contents logo, Atomic Reference Data for Electronic Structure Calculations. Mercury. Key to notation | HTML table ...

317

New Web Site Puts Atomic Time on Your Computer  

Science Conference Proceedings (OSTI)

New Web Site Puts Atomic Time on Your Computer. For Immediate Release: October 14, 1999. *. Bookmark and Share. Contact ...

2010-11-26T23:59:59.000Z

318

NIST: Uranium, Atomic Ref. Data for Elect. Struct. Calc.  

Science Conference Proceedings (OSTI)

Table of contents logo, Atomic Reference Data for Electronic Structure Calculations. Uranium. Key to notation | HTML table ...

319

Atoms Dressed with Light Show New Interactions, Could ...  

Science Conference Proceedings (OSTI)

... Contact: Mark Esser (301) 975-8735. Animation demonstrates enhancing low-energy atom cloud interactions with a light dressing. ...

2011-12-20T23:59:59.000Z

320

Workshop on atomic physics at the National Synchrotron Light Source  

SciTech Connect

The workshop emphasis was to acquaint the atomic physics community with the range of experimental capabilities of the NSLS. (GHT)

Jones, K.W.; Johnson, B.M.; Gregory, D.C. (eds.)

1981-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Atomic-scale Chemical Quantification of Oxide Interfaces Using ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2013. Symposium, Multifunctional Oxides. Presentation Title, Atomic-scale Chemical...

322

COQA: A CONCURRENT PROGRAMMING MODEL WITH UBIQUITOUS ATOMICITY  

E-Print Network (OSTI)

to any deeper understanding of atomic and molecular systems. The basic problem is to find the solutions

Smith, Scott F.

323

Communication: In search of four-atom chiral metal clusters  

Science Conference Proceedings (OSTI)

A combined study utilizing anion photoelectron spectroscopy and density functional theory was conducted to search for four-atom

Xinxing Zhang; Martin Tschurl; Evan Collins; Yi Wang; Qian Wang; Yawei Li; Qiang Sun; Puru Jena; Gerd Gantefoer; Ulrich Boesl

2013-01-01T23:59:59.000Z

324

NIST: Thorium, Atomic Ref. Data for Elect. Struct. Calc.  

Science Conference Proceedings (OSTI)

Table of contents logo, Atomic Reference Data for Electronic Structure Calculations. Thorium. Key to notation | HTML table ...

325

Optical Nanofibers for Manipulating and Probing Single-Atom Fluorescence  

E-Print Network (OSTI)

We demonstrate how optical nanofibers can be used to manipulate and probe single-atom fluorescence. We show that fluorescence photons from a very small number of atoms, average atom number of less than 0.1, around the nanofiber can readily be observed through single-mode optical fiber under resonant laser irradiation. We show also that optical nanofibers enable us to probe the van der Waals interaction between atoms and surface with high precision by observing the fluorescence excitation spectrum.

K. P. Nayak; P. N. Melentiev; M. Morinaga; Fam Le Kien; V. I. Balykin; K. Hakuta

2006-10-17T23:59:59.000Z

326

Correlated Quantum Memory: Manipulating Atomic Entanglement via Electromagnetically Induced Transparency  

E-Print Network (OSTI)

We propose a feasible scheme of quantum state storage and manipulation via electromagnetically induced transparency (EIT) in flexibly $united$ multi-ensembles of three-level atoms. For different atomic array configurations, one can properly steer the signal and the control lights to generate different forms of atomic entanglement within the framework of linear optics. These results shed new light on designing the versatile quantum memory devices by using, e.g., an atomic grid.

H. Jing; X. -J. Liu; M. -L. Ge; M. -S. Zhan

2004-10-05T23:59:59.000Z

327

Light-induced torque for the generation of persistent current flow in atomic gas Bose-Einstein condensates  

SciTech Connect

We show that a persistent current flow in an atomic gas Bose-Einstein condensate could be realized when the system is subject to two counterpropagating Laguerre-Gaussian so-called doughnut beams, creating a toroidal trap. The theory is developed involving a two-photon process within three atomic levels leading to a quantized light-induced torque which rotates the atoms, generating an atomic current flow in the ring. We also show that it is possible for the torque to be controlled and even switched on and off by varying the frequencies of the incident light, thereby allowing a mechanism for the control of the current flow.

Lembessis, V. E. [New York College, 38 Amalias Avenue, GR-105 58, Athens (Greece); Babiker, M. [Department of Physics, University of York, York YO10 5DD (United Kingdom)

2010-11-15T23:59:59.000Z

328

Method of performing MRI with an atomic magnetometer  

SciTech Connect

A method and apparatus are provided for performing an in-situ magnetic resonance imaging of an object. The method includes the steps of providing an atomic magnetometer, coupling a magnetic field generated by magnetically resonating samples of the object through a flux transformer to the atomic magnetometer and measuring a magnetic resonance of the atomic magnetometer.

Savukov, Igor Mykhaylovich; Matlashov, Andrei Nikolaevich; Espy, Michelle A; Volegov, Petr Lvovich; Kraus, Jr., Robert Henry; Zotev, Vadim Sergeyevich

2013-08-27T23:59:59.000Z

329

Method of performing MRI with an atomic magnetometer  

DOE Patents (OSTI)

A method and apparatus are provided for performing an in-situ magnetic resonance imaging of an object. The method includes the steps of providing an atomic magnetometer, coupling a magnetic field generated by magnetically resonating samples of the object through a flux transformer to the atomic magnetometer and measuring a magnetic resonance of the atomic magnetometer.

Savukov, Igor Mykhaylovich; Matlashov, Andrei Nikolaevich; Espy, Michelle A.; Volegov, Petr Lvovich; Kraus, Jr., Robert Henry; Zotev, Vadim Sergeyevich

2012-11-06T23:59:59.000Z

330

Determination of Atomic Data Pertinent to the Fusion Energy Program  

Science Conference Proceedings (OSTI)

We summarize progress that has been made on the determination of atomic data pertinent to the fusion energy program. Work is reported on the identification of spectral lines of impurity ions, spectroscopic data assessment and compilations, expansion and upgrade of the NIST atomic databases, collision and spectroscopy experiments with highly charged ions on EBIT, and atomic structure calculations and modeling of plasma spectra.

None

2013-06-11T23:59:59.000Z

331

A real system evaluation of hardware atomicity for software speculation  

Science Conference Proceedings (OSTI)

In this paper we evaluate the atomic region compiler abstraction by incorporating it into a commercial system. We find that atomic regions are simple and intuitive to integrate into an x86 binary-translation system. Furthermore, doing so trivially enables ... Keywords: atomicity, checkpoint, dynamic translation, optimization, speculation

Naveen Neelakantam; David R. Ditzel; Craig Zilles

2010-03-01T23:59:59.000Z

332

Duality in spaces of finite linear combinations of atoms  

E-Print Network (OSTI)

in Hp . In other words, Hp and Fp are both quotients of the space of "formal series" of (p, )-atoms understand the space Fp we prove now the following. Proposition. Given any sequence of (p, ) atoms aj and anyDuality in spaces of finite linear combinations of atoms Fulvio Ricci and Joan Verdera Abstract

Verdera, Joan

333

Duality in spaces of finite linear combinations of atoms  

E-Print Network (OSTI)

are both quotients of the space of "formal series" of (p, )-atoms with p coefficients, but the equivalence understand the space Fp we prove now the following. Proposition. Given any sequence of (p, ) atoms aj and anyDuality in spaces of finite linear combinations of atoms Fulvio Ricci and Joan Verdera Abstract

Autònoma de Barcelona, Universitat

334

Arithmetic Aspects of Atomic Structures Charles L. Fefferman  

E-Print Network (OSTI)

atoms. The problems encountered in this pro­ cess were numerous, and the quest for an understanding. It is responsible for the relevance of number theoretic terms in the atomic energy series, but goes beyond what one­ opments which have the common target of understanding atomic densities in rigorous terms. Among

Seco, Luis A.

335

Implemention of Blocking Coordinated Atomic Actions Based on Forward  

E-Print Network (OSTI)

participants. A very important decision was to structure any atomic action as a package: the atomic action Actions as Packages CA actions should correspond to the main structuring units of the language used, atomicity, coordinated error recovery, fault tolerant software structuring, conversations, transactions. 1

Newcastle upon Tyne, University of

336

Effect on the Lifetime of an Atom Undergoing a Dipole Transition Due to the Presence of a Resonating Atom  

Science Conference Proceedings (OSTI)

The modification of the transition rate from the Einstein A coefficient for an atomic dipole transition due to the presence of a similar atom is obtained without the use of damping theory.

Edwin A. Power

1967-01-01T23:59:59.000Z

337

Laser-Cooled Lithium Atoms: A New Source for Focused Ion Beams  

E-Print Network (OSTI)

Laser-Cooled Lithium Atoms: A New Source for Focused Ion Beams P R O J E C T L E A D E R : Jabez Mc E N T S Designed and constructed a laser-cooled, magneto-optical trap-based lithium ion source mounted on a commercial focused ion beam system, creating the world's first lithium ion microscope

Magee, Joseph W.

338

Pure superposition states of atoms generated by a bichromatic elliptically polarized filed  

E-Print Network (OSTI)

We find specific polarizations of components of a bichromatic field, which allow one to prepare pure superposition states of atoms, using the coherent population trapping effect. These $m$$-$$m$ states are prepared in the system of Zeeman substates of the ground-state hyperfine levels with arbitrary angular momenta $F_1$ and $F_2$. It is established that, in general case $m\

A. V. Taichenachev; V. I. Yudin; V. L. Velichansky; A. S. Zibrov

2005-03-03T23:59:59.000Z

339

Atoms in Flight: The Remarkable Connections between Atomic and Hadronic Physics  

SciTech Connect

Atomic physics and hadron physics are both based on Yang Mills gauge theory; in fact, quantum electrodynamics can be regarded as the zero-color limit of quantum chromodynamics. I review a number of areas where the techniques of atomic physics provide important insight into the theory of hadrons in QCD. For example, the Dirac-Coulomb equation, which predicts the spectroscopy and structure of hydrogenic atoms, has an analog in hadron physics in the form of light-front relativistic equations of motion which give a remarkable first approximation to the spectroscopy, dynamics, and structure of light hadrons. The renormalization scale for the running coupling, which is unambiguously set in QED, leads to a method for setting the renormalization scale in QCD. The production of atoms in flight provides a method for computing the formation of hadrons at the amplitude level. Conversely, many techniques which have been developed for hadron physics, such as scaling laws, evolution equations, and light-front quantization have equal utility for atomic physics, especially in the relativistic domain. I also present a new perspective for understanding the contributions to the cosmological constant from QED and QCD.

Brodsky, Stanley J.; /SLAC

2012-02-16T23:59:59.000Z

340

229Th the Bridge Between Nuclear and Atomic Interactions  

SciTech Connect

The precise measurement of time has been a goal of physicists for centuries. With every new increase in our ability to measure time we have discovered new phenomena. The most advanced clocks available to us currently are atomic clocks that use electronic transitions to track the passage of time. In this proposal, I put forward the framework for the first nuclear clock estimated to be 1000 to 10000 times more precise than the current atomic clocks. This research will explore in detail the atomic nuclear interactions and help perfect and refine current atomic-nuclear interaction models. The realization of a {sup 229}Th nuclear clock will allow tests of cosmology by measuring the change of the fine structure constant as a function of time. The results of these experiments could dramatically alter our view of the universe, its past and future evolution. Precision clocks - with fundamental physics applications - require a long-lived quantum transition (two-level system) that is immune to external perturbations. Nuclear transitions would be better suited than atomic transitions for these applications except that nuclear transitions are typically much higher in energy and therefore cannot be accessed with table-top lasers. There is, however, one promising nuclear transition: the doublet between the ground and first excited states of the {sup 229}Th nucleus discovered by Helmer and Reich. This doublet has an energy splitting of 7.6 {+-} 0.5 eV, a spin difference of 1 h-bar, and an excited state half-life that could be as long as hours. A precision clock based on the {sup 229}Th nuclear doublet has been proposed by Peik et al. Their design is similar to the ion clock research being conducted at NIST in Boulder, CO. However, the NIST researchers use atomic transitions for their frequency standards. In the {sup 229}Th nuclear doublet transition is the frequency standard while atomic transitions are used to cool the ions and for probing the state of the {sup 229}Th nucleus. Recently, Campbell et al. have trapped and cooled {sup 232}Th{sup 3+} at Georgia Institute of Technology. This is a large step forward in the realization of a nuclear clock. The Georgia Tech group is already a collaborator on this project and we are in discussions with the NIST Boulder group about collaboration. In order to determine the suitability of the {sup 229}Th nuclear doublet for a precision clock, the half-life of the excited-state needs to be measured. Current estimates of the half-life vary from 10 {micro}s to 1000 hours. The longer the half-life, the narrower the natural linewidth of the state and the more desirable the transition is for potential applications. In this proposal, I outline the necessary research to be conducted to determine the half-life and exact wavelength of the nuclear doublet transition in {sup 229}Th. This research will lead to a deeper understanding of atomic-nuclear interactions important for our knowledge of high energy density science. It will provide a spectroscopy measurement of the lowest known nuclear transition ever and open the doorway for the development of a nuclear clock with unprecedented precision.

Burke, J T; Casperson, R J; Swanberg, E L; Thomas, D

2010-12-02T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Saturation of fidelity in the atom-optics kicked rotor  

E-Print Network (OSTI)

We show that the quantum fidelity is accessible to cold atom experiments for a large class of evolutions in periodical potentials, properly taking into account the experimental initial conditions of the atomic ensemble. We prove analytically that, at the fundamental quantum resonances of the atom-optics kicked rotor, the fidelity saturates at a constant, time-independent value after a small number of kicks. The latter saturation arises from the bulk of the atomic ensemble, whilst for the resonantly accelerated atoms the fidelity is predicted to decay slowly according to a power law.

Sandro Wimberger; Andreas Buchleitner

2006-03-10T23:59:59.000Z

342

Atomizing apparatus for making polymer and metal powders and whiskers  

DOE Patents (OSTI)

Method for making polymer particulates, such as spherical powder and whiskers, by melting a polymer material under conditions to avoid thermal degradation of the polymer material, atomizing the melt using gas jet means in a manner to form atomized droplets, and cooling the droplets to form polymer particulates, which are collected for further processing. Atomization parameters can be controlled to produce polymer particulates with controlled particle shape, particle size, and particle size distribution. For example, atomization parameters can be controlled to produce spherical polymer powders, polymer whiskers, and combinations of spherical powders and whiskers. Atomizing apparatus also is provided for atoomizing polymer and metallic materials.

Otaigbe, Joshua U. (Ames, IA); McAvoy, Jon M. (Moline, IL); Anderson, Iver E. (Ames, IA); Ting, Jason (Ames, IA); Mi, Jia (Pittsburgh, PA); Terpstra, Robert (Ames, IA)

2003-03-18T23:59:59.000Z

343

ATOMIC HYDROGEN IN A GALACTIC CENTER OUTFLOW  

SciTech Connect

We describe a population of small, high-velocity, atomic hydrogen clouds, loops, and filaments found above and below the disk near the Galactic center. The objects have a mean radius of 15 pc, velocity widths of {approx}14 km s{sup -1}, and are observed at |z| heights up to 700 pc. The velocity distribution of the clouds shows no signature of Galactic rotation. We propose a scenario where the clouds are associated with an outflow from a central star-forming region at the Galactic center. We discuss the clouds as entrained material traveling at {approx}200 km s{sup -1} in a Galactic wind.

McClure-Griffiths, N. M.; Green, J. A.; Hill, A. S. [Australia Telescope National Facility, CSIRO Astronomy and Space Science, Marsfield, NSW 2122 (Australia); Lockman, F. J. [National Radio Astronomy Observatory, Green Bank, WV 24944 (United States); Dickey, J. M. [School of Physics and Mathematics, University of Tasmania, TAS 7001 (Australia); Gaensler, B. M.; Green, A. J., E-mail: naomi.mcclure-griffiths@csiro.au [Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006 (Australia)

2013-06-10T23:59:59.000Z

344

Method for producing uranium atomic beam source  

DOE Patents (OSTI)

A method for producing a beam of neutral uranium atoms is obtained by vaporizing uranium from a compound UM.sub.x heated to produce U vapor from an M boat or from some other suitable refractory container such as a tungsten boat, where M is a metal whose vapor pressure is negligible compared to that of uranium at the vaporization temperature. The compound, for example, may be the uranium-rhenium compound, URe.sub.2. An evaporation rate in excess of about 10 times that of conventional uranium beam sources is produced.

Krikorian, Oscar H. (Danville, CA)

1976-06-15T23:59:59.000Z

345

Charged-Particle Impact Ionization of Atoms  

Science Conference Proceedings (OSTI)

We have developed a hybrid method to treat charged-particle impact ionization of complex atoms and ions. The essential idea is to describe the interaction between a fast projectile and the target perturbatively, up to second order, while the initial bound state and the ejected-electron--residual-ion interaction can be handled via a convergent R-matrix with pseudo-states (close-coupling) expansion. Example results for ionization of the heavy noble gases (Ne-Xe) by positron and electron impact are presented. The general scheme for a distorted-wave treatment of ionization by heavy-particle impact is described.

Bartschat, Klaus; Guan Xiaoxu [Department of Physics and Astronomy, Drake University, Des Moines, IA 50311 (United States)

2008-08-08T23:59:59.000Z

346

Stochastic Methods in Atomic Systems and QED  

E-Print Network (OSTI)

We show that treating the blackbody radiation field as a heat bath enables one to utilize powerful techniques from the realm of stochastic physics (such as the fluctuation-dissipation theorem and the related radiation damping) in order to treat problems that could not be treated rigorously by conventional methods. We illustrate our remarks by discussing specifically the effect of temperature on atomic spectral lines, and the solution to the problem of runaway solutions in the equation of motion of a radiating electron. We also present brief discussions relating to anomalous diffusion and wave packet spreading in a radiation field and the influence of quantum effects on the laws of thermodynamics.

R. F. O'Connell

2010-09-22T23:59:59.000Z

347

The New Element Berkelium (Atomic Number 97)  

DOE R&D Accomplishments (OSTI)

An isotope of the element with atomic number 97 has been discovered as a product of the helium-ion bombardment of americium. The name berkelium, symbol Bk, is proposed for element 97. The chemical separation of element 97 from the target material and other reaction products was made by combinations of precipitation and ion exchange adsorption methods making use of its anticipated (III) and (IV) oxidation states and its position as a member of the actinide transition series. The distinctive chemical properties made use of in its separation and the equally distinctive decay properties of the particular isotope constitute the principal evidence for the new element.

Seaborg, G. T.; Thompson, S. G.; Ghiorso, A.

1950-04-26T23:59:59.000Z

348

Theoretical atomic physics code development I: CATS: Cowan Atomic Structure Code  

Science Conference Proceedings (OSTI)

An adaptation of R.D. Cowan's Atomic Structure program, CATS, has been developed as part of the Theoretical Atomic Physics (TAPS) code development effort at Los Alamos. CATS has been designed to be easy to run and to produce data files that can interface with other programs easily. The CATS produced data files currently include wave functions, energy levels, oscillator strengths, plane-wave-Born electron-ion collision strengths, photoionization cross sections, and a variety of other quantities. This paper describes the use of CATS. 10 refs.

Abdallah, J. Jr.; Clark, R.E.H.; Cowan, R.D.

1988-12-01T23:59:59.000Z

349

Forecast of Standard Atomic Weights for the Mononuclidic Elements 2011  

SciTech Connect

In this short report, I will provide an early warning about potential changes to the standard atomic weight values for the twenty mononuclidic and the so-called pseudo-mononuclidic ({sup 232}Th and {sup 231}Pa) chemical elements due to the estimated changes in the mass values to be published in the next Atomic Mass Tables within the next two years. There have been many new measurements of atomic masses, since the last published Atomic Mass Table. The Atomic Mass Data Center has released an unpublished version of the present status of the atomic mass values as a private communication. We can not update the Standard Atomic Weight Table at this time based on these unpublished values but we can anticipate how many changes are probably going to be expected in the next few years on the basis of the forthcoming publication of the Atomic Mass Table. I will briefly discuss the procedures that the Atomic Weights Commission used in deriving the recommended Standard Atomic Weight values and their uncertainties from the atomic mass values. I will also discuss some concern raised about a proposed change in the definition of the mole. The definition of the mole is now connected directly to the mass of a {sup 12}C isotope (which is defined as 12 exactly) and to the kilogram. A change in the definition of the mole will probably impact the mass of {sup 12}C.

Holden, N.E.; Holden, N.; Holden,N.E.

2011-07-27T23:59:59.000Z

350

Mixtures of bosonic and fermionic atoms in optical lattices  

Science Conference Proceedings (OSTI)

We discuss the theory of mixtures of bosonic and fermionic atoms in periodic potentials at zero temperature. We derive a general Bose-Fermi Hubbard Hamiltonian in a one-dimensional optical lattice with a superimposed harmonic trapping potential. We study the conditions for linear stability of the mixture and derive a mean-field criterion for the onset of a bosonic superfluid transition. We investigate the ground-state properties of the mixture in the Gutzwiller formulation of mean-field theory, and present numerical studies of finite systems. The bosonic and fermionic density distributions and the onset of quantum phase transitions to demixing and to a bosonic Mott-insulator are studied as a function of the lattice potential strength. The existence is predicted of a disordered phase for mixtures loaded in very deep lattices. Such a disordered phase possessing many degenerate or quasidegenerate ground states is related to a breaking of the mirror symmetry in the lattice.

Albus, Alexander [Institut fuer Physik, Universitaet Potsdam, Am Neuen Palais 10, D-14469 Potsdam, (Germany); Dipartimento di Fisica, Universita di Salerno, Via S. Allende, I-84081 Baronissi (Saudi Arabia), Italy and Istituto Nazionale per la Fisica della Materia, I-84081 Baronissi (SA), (Italy); Illuminati, Fabrizio [Dipartimento di Fisica, Universita di Salerno, Via S. Allende, I-84081 Baronissi (Saudi Arabia), Italy and Istituto Nazionale per la Fisica della Materia, I-84081 Baronissi (SA), (Italy); Eisert, Jens [Institut fuer Physik, Universitaet Potsdam, Am Neuen Palais 10, D-14469 Potsdam, (Germany); Blackett Laboratory, Imperial College London, Prince Consort Road, SW7 2BW London, (United Kingdom)

2003-08-01T23:59:59.000Z

351

Autoantibodies and immunoglobulins among atomic bomb survivors  

Science Conference Proceedings (OSTI)

The purpose of this study was to determine if exposure to atomic bomb radiation affects immune responsiveness, such as the occurrence of autoantibodies and levels of immunoglobulins. Rheumatoid factor, antinuclear antibody, antithyroglobulin antibody, anti-thyroid-microsomal antibody and immunoglobulin levels (IgG, IgM, IgA and IgE) were measured among 2,061 individuals exposed to atomic bomb radiation in Hiroshima and Nagasaki whose estimated doses ranged from 0 to 5.6 Gy. The prevalence and titers of rheumatoid factor were found to be increased in the individuals exposed to higher radiation doses. The IgA level in females and the IgM level in both sexes increased as radiation dose increased, although the effects of radiation exposure were not large. No effect of radiation was found on the prevalence of antinuclear antibody, antithyroglobulin antibody and anti-thyroid-microsomal antibody or on the levels of IgG and IgE. 32 refs., 2 figs., 3 tabs.

Fujiwara, Saeko; Akahoshi, Masazumi; Kodama, Kazunori; Shimaoka, Katsutaro; Akiyama, Mitoshi [Radiation Effects Research Foundation, Hiroshima (Japan); Carter, R.L. [Univ. of Florida, Gainesville, FL (United States); Yamakido, Michio [Hiroshima Univ. School of Medicine (Japan)

1994-01-01T23:59:59.000Z

352

Atomic Scale Characterization of Complex Oxide Interfaces  

SciTech Connect

Complex oxides exhibit the most disparate behaviors, from ferroelectricity to high Tc superconductivity, colossal magnetoresistance to insulating properties. For these reasons, oxide thin films are of interest for electronics and the emerging field of spintronics. But epitaxial complex oxide ultrathin films and heterostructures can be significantly affected or even dominated by the presence of interfaces and may exhibit intriguing new physical properties quite different from the bulk. A study of the relations between structure and chemistry at the atomic scale is needed to understand the macroscopic properties of such "interface-controlled" materials. For this purpose, the combination of aberration corrected Z-contrast scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) represents a very powerful tool. The availability of sub- ngstr m probes allows a level of unprecedented detail when analyzing not only the interface structure with sensitivity to single atoms, but also the interface chemistry. In this work state of the art STEM-EELS will be applied to the study of different oxide interfaces in heterostructures with titanates, manganites and cuprates based on the perovskite structure.

Varela del Arco, Maria [ORNL; Pennycook, Timothy J [ORNL; Tian, Wei [ORNL; Mandrus, David [ORNL; Pennycook, Stephen J [ORNL; Pena, V. [Universidad Complutense, Spain; Sefrioui, Z. [Universidad Complutense, Spain; Santamaria, J. [Universidad Complutense, Spain

2006-01-01T23:59:59.000Z

353

Atomic-Layer Engineering of Oxide Superconductors  

SciTech Connect

Molecular beam epitaxy technique has enabled synthesis of atomically smooth thin films, multilayers, and superlattices of cuprates and other complex oxides. Such heterostructures show high temperature superconductivity and enable novel experiments that probe the basic physics of this phenomenon. For example, it was established that high temperature superconductivity and anti-ferromagnetic phases separate on Angstrom scale, while the pseudo-gap state apparently mixes with high temperature superconductivity over an anomalously large length scale (the 'Giant Proximity Effect'). We review some recent experiments on such films and superlattices, including X-ray diffraction, atomic force microscopy, angle-resolved time of flight ion scattering and recoil spectroscopy, transport measurements, high resolution transmission electron microscopy, resonant X-ray scattering, low-energy muon spin resonance, and ultrafast photo-induced reflection high energy electron diffraction. The results include an unambiguous demonstration of strong coupling of in-plane charge excitations to out-of-plane lattice vibrations, a discovery of interface high temperature superconductivity that occurs in a single CuO{sub 2} plane, evidence for local pairs, and establishing tight limits on the temperature range of superconducting fluctuations.

Bozovic I.; Bollinger, A.T.; Eckstein, J.N.; Dubuis, G.; Pavuna, D.

2012-03-01T23:59:59.000Z

354

The HERMES Polarized Atomic Beam Source  

Science Conference Proceedings (OSTI)

The atomic beam source (ABS) provides nuclear polarized hydrogen or deuterium atoms for the HERMES target at flow rates of about 6.5 ? 1016H?/s (hydrogen in two hyperfine substates) and 6.0 ? 1016D?/s (deuterium in three hyperfine substates). The degree of dissociation of 93% for H (95% for D) at the entrance of the storage cell and the nuclear polarization of around 0.97 (H) and 0.92 (D) have been found to be constant within a a couple of percent over the whole running period of the HERMES experiment. A new dissociator (MWD) based on a microwave discharge at 2.45 GHz has been developed and installed into the HERMES?ABS in 2000. Since the velocity distribution of the MWD differs from that of the RFD the intensity could be increased further with a modified sextupole magnet system. For this purpose the way for a new start generator for sextupole tracking calculations was opened. Monte?Carlo simulations were successfully used to describe the gas expansion between nozzle

A. Nass; HERMES target group

2003-01-01T23:59:59.000Z

355

Ionization of Rydberg atoms by blackbody radiation  

E-Print Network (OSTI)

We have studied an ionization of alkali-metal Rydberg atoms by blackbody radiation (BBR). The results of the theoretical calculations of ionization rates of Li, Na, K, Rb and Cs Rydberg atoms are presented. Calculations have been performed for nS, nP and nD states which are commonly used in a variety of experiments, at principal quantum numbers n=8-65 and at the three ambient temperatures of 77, 300 and 600 K. A peculiarity of our calculations is that we take into account the contributions of BBR-induced redistribution of population between Rydberg states prior to photoionization and field ionization by extraction electric field pulses. The obtained results show that these phenomena affect both the magnitude of measured ionization rates and shapes of their dependences on n. A Cooper minimum for BBR-induced transitions between bound Rydberg states of Li has been found. The calculated ionization rates are compared with our earlier measurements of BBR-induced ionization rates of Na nS and nD Rydberg states with ...

Beterov, I I; Ryabtsev, I I; Entin, V M; Ekers, A; Bezuglov, N N

2008-01-01T23:59:59.000Z

356

The Atomic Safety and Licensing Board Panel  

SciTech Connect

Through the Atomic Energy Act, Congress made is possible for the public to get a full and fair hearing on civilian nuclear matters. Individuals who are directly affected by any licensing action involving a facility producing or utilizing nuclear materials may participate in a formal hearing, on the record, before independent judges on the Atomic Safety and Licensing Board Panel (ASLBP or Panel). Frequently, in deciding whether a license, permit, amendment, or extension should be granted to a particular applicant, the Panel members must be more than mere umpires. If appropriate, they are authorized to go beyond the issues the parties place before them in order to identify, explore, and resolve significant questions involving threats to the public health and safety that come to a board`s attention during the proceedings. This brochure explains the purpose of the panel. Also addressed are: type of hearing handled; method of public participation; formality of hearings; high-level waste; other panel responsibilities and litigation technology.

NONE

1998-03-01T23:59:59.000Z

357

Atomic clocks with suppressed blackbody radiation shift  

E-Print Network (OSTI)

We develop a nonstandard concept of atomic clocks where the blackbody radiation shift (BBRS) and its temperature fluctuations can be dramatically suppressed (by one to three orders of magnitude) independent of the environmental temperature. The suppression is based on the fact that in a system with two accessible clock transitions (with frequencies v1 and v2) which are exposed to the same thermal environment, there exists a "synthetic" frequency v_{syn} (v1-e12 v2) largely immune to the BBRS. As an example, it is shown that in the case of ion 171Yb+ it is possible to create a clock in which the BBRS can be suppressed to the fractional level of 10^{-18} in a broad interval near room temperature (300\\pm 15 K). We also propose a realization of our method with the use of an optical frequency comb generator stabilized to both frequencies v1 and v2. Here the frequency v_{syn} is generated as one of the components of the comb spectrum and can be used as an atomic standard.

V. I. Yudin; A. V. Taichenachev; M. V. Okhapkin; S. N. Bagayev; Chr. Tamm; E. Peik; N. Huntemann; T. E. Mehlstaubler; F. Riehle

2011-03-03T23:59:59.000Z

358

String model of the Hydrogen Atom  

E-Print Network (OSTI)

A non-moving electron hydrogen model is proposed, resolving a long standing contradiction (94 years) in the hydrogen atom. This, however, forces to not use the "in an orbit point particle kinetic energy" as the phenomenon responsible for the atom stability. The repulsion between the masses of the electron and proton is what is responsible of such stability. The mass of the electron is a field fully described by the uncertainty principle through the confinement of the particle, which is also consistent with the general theory of relativity that states: "mass-energy tells the space how to bend". Ergo, mass exerts a tension on its surrounding space and the lighter the mass the larger the space it will occupy. Based on this concept it is proposed that the orbital is the electron. The electron's orbitals are just the electron's different ways of intersecting the space; with different magnetic momenta. The coupling of this momenta with the magnetic moment of the proton finally explains the hyperfine structure of the hydrogen spectrum with an overwhelming simplicity

Omar Yepez

2007-01-31T23:59:59.000Z

359

L. James Rainwater and the Atomic Nuclei  

NLE Websites -- All DOE Office Websites (Extended Search)

L. James Rainwater and the Atomic Nucleus L. James Rainwater and the Atomic Nucleus Resources with Additional Information James Rainwater Courtesy AIP Emilio Segre Visual Archives, W. F. Meggers Gallery of Nobel Laureates "During W.W. II, I [James Rainwater] worked ... [on the] Manhattan Project, mainly doing pulsed neutron spectroscopy using the small Columbia cyclotron. ... [Maria Geoppert-Mayer] shell model suggestion in 1949 was a great triumph and fitted my belief that a nuclear shell model should represent a proper approach to understanding nuclear structure. Combined with developments of Weizsaker's semi-empirical explanation of nuclear binding, and the Bohr-Wheeler 1939 paper on nuclear fission, emphasizing distorted nuclear shapes, I was prepared to see an explanation of large nuclear quadrupole moments. The full concept came to me in late 1949 when attending a colloquium by Prof. C.H. Townes who described the experimental situation for nuclear quadrupole moments. It was a fortuitous situation made even more so by the fact that I was sharing an office with Aage Bohr that year. We had many discussions of the implications, subsequently very successfully exploited by Bohr, [Ben] Mottelson, and others of the Copenhagen Institute."1

360

Off-diagonal geometric phase of atom-electron coupling in hydrogen atom  

E-Print Network (OSTI)

In this paper, the off-diagonal geometric phase of thermal state in hydrogen atom under the effects of external magnetic field is considered. Increasing temperature tends to suppress the off-diagonal geometric phase, including 1-order and 2-order cases. On the other hand, the relationship between the geometric phase and external magnetic field is discussed.

Guo-Qiang Zhu

2009-07-10T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Theoretical atomic physics code development III TAPS: A display code for atomic physics data  

SciTech Connect

A large amount of theoretical atomic physics data is becoming available through use of the computer codes CATS and ACE developed at Los Alamos National Laboratory. A new code, TAPS, has been written to access this data, perform averages over terms and configurations, and display information in graphical or text form. 7 refs., 13 figs., 1 tab.

Clark, R.E.H.; Abdallah, J. Jr.; Kramer, S.P.

1988-12-01T23:59:59.000Z

362

Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator  

E-Print Network (OSTI)

The reliable detection of single quantum particles has revolutionized the field of quantum optics and quantum information processing. For several years, researchers have aspired to extend such detection possibilities to larger scale strongly correlated quantum systems, in order to record in-situ images of a quantum fluid in which each underlying quantum particle is detected. Here we report on fluorescence imaging of strongly interacting bosonic Mott insulators in an optical lattice with single-atom and single-site resolution. From our images, we fully reconstruct the atom distribution on the lattice and identify individual excitations with high fidelity. A comparison of the radial density and variance distributions with theory provides a precise in-situ temperature and entropy measurement from single images. We observe Mott-insulating plateaus with near zero entropy and clearly resolve the high entropy rings separating them although their width is of the order of only a single lattice site. Furthermore, we show how a Mott insulator melts for increasing temperatures due to a proliferation of local defects. Our experiments open a new avenue for the manipulation and analysis of strongly interacting quantum gases on a lattice, as well as for quantum information processing with ultracold atoms. Using the high spatial resolution, it is now possible to directly address individual lattice sites. One could, e.g., introduce local perturbations or access regions of high entropy, a crucial requirement for the implementation of novel cooling schemes for atoms on a lattice.

Jacob F. Sherson; Christof Weitenberg; Manuel Endres; Marc Cheneau; Immanuel Bloch; Stefan Kuhr

2010-06-18T23:59:59.000Z

363

Sixteenth International Conference on the physics of electronic and atomic collisions  

SciTech Connect

This report contains abstracts of papers on the following topics: photons, electron-atom collisions; electron-molecule collisions; electron-ion collisions; collisions involving exotic species; ion- atom collisions, ion-molecule or atom-molecule collisions; atom-atom collisions; ion-ion collisions; collisions involving rydberg atoms; field assisted collisions; collisions involving clusters and collisions involving condensed matter.

Dalgarno, A.; Freund, R.S.; Lubell, M.S.; Lucatorto, T.B. (eds.)

1989-01-01T23:59:59.000Z

364

Atoms of multistationarity in chemical reaction networks  

E-Print Network (OSTI)

Chemical reaction networks taken with mass-action kinetics are dynamical systems that arise in chemical engineering and systems biology. Deciding whether a chemical reaction network admits multiple positive steady states is to determine existence of multiple positive solutions to a system of polynomials with unknown coefficients. In this work, we consider the question of whether the minimal (in a precise sense) networks, which we propose to call `atoms of multistationarity,' characterize the entire set of multistationary networks. We show that if a subnetwork admits multiple nondegenerate positive steady states, then these steady states can be extended to establish multistationarity of a larger network, provided that the two networks share the same stoichiometric subspace. Our result provides the mathematical foundation for a technique used by Siegal-Gaskins et al. of establishing bistability by way of `network ancestry.' Here, our main application is for enumerating small multistationary continuous-flow stir...

Joshi, Badal

2011-01-01T23:59:59.000Z

365

Testing CPT Invariance with Antiprotonic Helium Atoms  

Science Conference Proceedings (OSTI)

The structure of matter is related to symmetries at every level of study. CPT symmetry is one of the most important laws of field theory: it states the invariance of physical properties when one simultaneously changes the signs of the charge and of the spatial and time coordinates of free elementary particles. Although in general opinion CPT symmetry is not violated in Nature, there are theoretical attempts to develop CPT-violating models. The Antiproton Decelerator at CERN has been built to test CPT invariance. The ASACUSA experiment compares the properties of particles and antiparticles by studying the antiprotonic helium atom via laser spectroscopy and measuring the mass, charge and magnetic moment of the antiproton as compared to those of the proton.

Horvath, Dezso [KFKI Research Institute for Particle and Nuclear Physics, H-1525 Budapest, Hungary and Institute of Nuclear Research (ATOMKI), Debrecen (Hungary)

2008-08-08T23:59:59.000Z

366

Accelerating universe, WEP violation and antihydrogen atoms  

E-Print Network (OSTI)

Apart from the suspected violation of the CPT invariance, we might expect if the measurements of antihydrogen atoms provide testing Weak Equivalence Principle (WEP) in the gravitational phenomena. We start with how its violation can be related to the expected idea of unification of particle physics and gravitation, an attempt beyond the standard theories, including general relativity of Einstein. A particular emphasis will be placed on the issue of an accelerating universe, a rather recent development since nearly 10 years ago, suggesting a strong motivation toward attempts beyond the conventional concepts of the traditional cosmology. We face today's version of the cosmological constant problem. A candidate of the new ingredient appears to be provided by a scalar field, sometimes under the names like quintessence or dark-energy. In this article, we discuss the subject from a point of view of a more theoretical approach based on the scalar-tensor theory of gravitation. By exploiting the concepts of conformal ...

Fujii, Yasunori

2008-01-01T23:59:59.000Z

367

Atomic line emission analyzer for hydrogen isotopes  

DOE Patents (OSTI)

Apparatus for isotopic analysis of hydrogen comprises a low pressure chamber into which a sample of hydrogen is introduced and then exposed to an electrical discharge to excite the electrons of the hydrogen atoms to higher energy states and thereby cause the emission of light on the return to lower energy states, a Fresnel prism made at least in part of a material anomalously dispersive to the wavelengths of interest for dispersing the emitted light, and a photodiode array for receiving the dispersed light. The light emitted by the sample is filtered to pass only the desired wavelengths, such as one of the lines of the Balmer series for hydrogen, the wavelengths of which differ slightly from one isotope to another. The output of the photodiode array is processed to determine the relative amounts of each isotope present in the sample. Additionally, the sample itself may be recovered using a metal hydride.

Kronberg, James W. (108 Independent Blvd., Aiken, SC 29801)

1993-01-01T23:59:59.000Z

368

Atomic line emission analyzer for hydrogen isotopes  

DOE Patents (OSTI)

Apparatus for isotopic analysis of hydrogen comprises a low pressure chamber into which a sample of hydrogen is introduced and then exposed to an electrical discharge to excite the electrons of the hydrogen atoms to higher energy states and thereby cause the emission of light on the return to lower energy states, a Fresnel prism made at least in part of a material anomalously dispersive to the wavelengths of interest for dispersing the emitted light, and a photodiode array for receiving the dispersed light. The light emitted by the sample is filtered to pass only the desired wavelengths, such as one of the lines of the Balmer series for hydrogen, the wavelengths of which differ slightly from one isotope to another. The output of the photodiode array is processed to determine the relative amounts of each isotope present in the sample. Additionally, the sample itself may be recovered using, a metal hydride.

Kronberg, J.W.

1991-05-08T23:59:59.000Z

369

Atomic line emission analyzer for hydrogen isotopes  

DOE Patents (OSTI)

Apparatus for isotopic analysis of hydrogen comprises a low pressure chamber into which a sample of hydrogen is introduced and then exposed to an electrical discharge to excite the electrons of the hydrogen atoms to higher energy states and thereby cause the emission of light on the return to lower energy states, a Fresnel prism made at least in part of a material anomalously dispersive to the wavelengths of interest for dispersing the emitted light, and a photodiode array for receiving the dispersed light. The light emitted by the sample is filtered to pass only the desired wavelengths, such as one of the lines of the Balmer series for hydrogen, the wavelengths of which differ slightly from one isotope to another. The output of the photodiode array is processed to determine the relative amounts of each isotope present in the sample. Additionally, the sample itself may be recovered using a metal hydride.

Kronberg, J.W.

1993-03-30T23:59:59.000Z

370

Atomic Layer Deposition for SRF Cavities  

SciTech Connect

We have begun using Atomic Layer Deposition (ALD) to synthesize a variety of surface coatings on coupons and cavities as part of an effort to produce rf structures with significantly better performance and yield than those obtained from bulk niobium, The ALD process offers the possibility of conformally coating complex cavity shapes with precise layered structures with tightly constrained morphology and chemical properties. Our program looks both at the metallurgy and superconducting properties of these coatings, and also their performance in working structures. Initial results include: 1) evidence from point contact tunneling showing magnetic oxides can be a significant limitation to high gradient operation, 2) experimental results showing the production sharp niobium/oxide interfaces from a high temperature bake of ALD coated Al2O3 on niobium surfaces, 3) results from ALD coated structures.

Norem, J; Pellin, M J; Antoine, C Z; Ciovati, G; Kneisel, P; Reece, C E; Rimmer, R A; Cooley, L; Gurevich, A V; Ha, Y; Proslier, Th

2009-05-01T23:59:59.000Z

371

Present and Future Computing needs in Atomic Physics  

NLE Websites -- All DOE Office Websites (Extended Search)

in Atomic Physics in Atomic Physics John Ludlow, Connor Ballance, Stuart Loch, Teck-Ghee Lee, Mitch Pindzola Auburn University Science Goals * To calculate atomic and molecular collision processes of relevance to controlled fusion energy * Processes include electron-impact excitation and ionization of atoms and their ions, dielectronic recombination of ions and heavy particle impact excitation, ionization and charge transfer with atoms and ions * Ensure collisional data are interfaced with plasma modelling codes (ADAS, TRANSP) * We are presently focused on light elements like H, He, Li, Be, B, C, Ne * In the next 3-5 years we shall look at heavier fusion related elements such as Xe, Mo, W ADAS * The fundamental atomic data is processed through the ADAS suite of codes to give generalized collisional-

372

Truman Signs Atomic Energy Act | National Nuclear Security Administration  

NLE Websites -- All DOE Office Websites (Extended Search)

Truman Signs Atomic Energy Act | National Nuclear Security Administration Truman Signs Atomic Energy Act | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Truman Signs Atomic Energy Act Truman Signs Atomic Energy Act August 01, 1946 Washington, DC Truman Signs Atomic Energy Act President Truman signs the Atomic Energy Act of 1946, leading to the

373

Truman Signs Atomic Energy Act | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Truman Signs Atomic Energy Act | National Nuclear Security Administration Truman Signs Atomic Energy Act | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Truman Signs Atomic Energy Act Truman Signs Atomic Energy Act August 01, 1946 Washington, DC Truman Signs Atomic Energy Act President Truman signs the Atomic Energy Act of 1946, leading to the

374

Reaffirming America's Commitment to the Peaceful Use of the Atom |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Reaffirming America's Commitment to the Peaceful Use of the Atom Reaffirming America's Commitment to the Peaceful Use of the Atom Reaffirming America's Commitment to the Peaceful Use of the Atom September 19, 2011 - 5:03pm Addthis Secretary Chu meets with officials during a visit to the International Atomic Energy Agency's (IAEA) Incident and Emergency Center in Vienna. | Photo Courtesy of IAEA. Secretary Chu meets with officials during a visit to the International Atomic Energy Agency's (IAEA) Incident and Emergency Center in Vienna. | Photo Courtesy of IAEA. Dan Leistikow Dan Leistikow Former Director, Office of Public Affairs Secretary Chu is in Vienna, Austria as he leads the United States delegation to the General Conference of the International Atomic Energy Agency, the United Nations organization dedicated to the safe and peaceful

375

Gosling, The Manhattan Project: Making the Atomic Bomb | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Gosling, The Manhattan Project: Making the Atomic Gosling, The Manhattan Project: Making the Atomic Bomb Gosling, The Manhattan Project: Making the Atomic Bomb F.G. Gosling. The Manhattan Project: Making the Atomic Bomb. DOE/MA-0002 Revised. Washington, D.C.: Department of Energy, 2010. 115 pp., with 38 pp. photo gallery). From the Forward to the 2010 Edition: "In a national survey at the turn of the millennium, journalists and historians ranked the dropping of the atomic bomb and the surrender of Japan to end the Second World War as the top story of the twentieth century. The advent of nuclear weapons, brought about by the Manhattan Project, not only helped bring an end to World War II but ushered in the atomic age and determined how the next war-the Cold War-would be fought. The Manhattan Project also became the organizational model behind

376

Strongly driven one-atom laser and decoherence monitoring  

Science Conference Proceedings (OSTI)

We propose the implementation of a strongly driven one-atom laser, based on the off-resonant interaction of a three-level atom in {lambda} configuration with a single cavity mode and three laser fields. We show that the system can be described equivalently by a two-level atom resonantly coupled to the cavity and driven by a strong effective coherent field. The effective dynamics can be solved exactly, including a thermal field bath, allowing an analytical description of field statistics and entanglement properties. We also show the possible generation of quantum superposition (Schroedinger cat) states for the whole atom-field system and for the field alone after atomic measurement. We propose a way to monitor the system decoherence by measuring atomic populations. Finally, we confirm the validity of our model through numerical solutions.

Lougovski, P. [Hearne Institute for Theoretical Physics, Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, Louisiana 70803 (United States); Casagrande, F.; Lulli, A. [Dipartimento di Fisica, Universita di Milano, Via Celoria 16, 20133 Milan (Italy); Solano, E. [Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universitaet, Theresienstrasse 37, 80333 Munich (Germany); Seccion Fisica, Departamento de Ciencias, Pontificia Universidad Catolica del Peru, Apartado 1761, Lima (Peru)

2007-09-15T23:59:59.000Z

377

Hard probes of strongly-interacting atomic gases  

SciTech Connect

We investigate properties of an energetic atom propagating through strongly interacting atomic gases. The operator product expansion is used to systematically compute a quasiparticle energy and its scattering rate both in a spin-1/2 Fermi gas and in a spinless Bose gas. Reasonable agreement with recent quantum Monte Carlo simulations even at a relatively small momentum k/kF > 1.5 indicates that our large-momentum expansions are valid in a wide range of momentum. We also study a differential scattering rate when a probe atom is shot into atomic gases. Because the number density and current density of the target atomic gas contribute to the forward scattering only, its contact density (measure of short-range pair correlation) gives the leading contribution to the backward scattering. Therefore, such an experiment can be used to measure the contact density and thus provides a new local probe of strongly interacting atomic gases.

Nishida, Yusuke [Los Alamos National Laboratory

2012-06-18T23:59:59.000Z

378

Strongly-Driven One-Atom Laser and Decoherence Monitoring  

E-Print Network (OSTI)

We propose the implementation of a strongly-driven one-atom laser, based on the off-resonant interaction of a three-level atom in $\\Lambda$-configuration with a single cavity mode and three laser fields. We show that the system can be described equivalently by a two-level atom resonantly coupled to the cavity and driven by a strong effective coherent field. The effective dynamics can be solved exactly, including a thermal field bath, allowing an analytical description of field statistics and entanglement properties. We also show the possible generation of Schr\\"odinger cat states for the whole atom-field system and for the field alone after atomic measurement. We propose a way to monitor the system decoherence by measuring atomic population. Finally, we confirm the validity of our model through numerical solutions.

P. Lougovski; F. Casagrande; A. Lulli; E. Solano

2007-02-06T23:59:59.000Z

379

Controlled generation of field squeezing with cold atomic clouds coupled to a superconducting transmission line resonator  

E-Print Network (OSTI)

We propose an efficient method for controlled generation of field squeezing with cold atomic clouds trapped close to a superconducting transmission line resonator. It is shown that, based on the coherent strong magnetic coupling between the collective atomic spins and microwave fields in the transmission line resonator, two-mode or single mode field squeezed states can be generated through coherent control on the dynamics of the system. The degree of squeezing and preparing time can be directly controlled through tuning the external classical fields. This protocol may offer a promising platform for implementing scalable on-chip quantum information processing with continuous variables.

Li, Peng-Bo

2010-01-01T23:59:59.000Z

380

Controlled generation of field squeezing with cold atomic clouds coupled to a superconducting transmission line resonator  

E-Print Network (OSTI)

We propose an efficient method for controlled generation of field squeezing with cold atomic clouds trapped close to a superconducting transmission line resonator. It is shown that, based on the coherent strong magnetic coupling between the collective atomic spins and microwave fields in the transmission line resonator, two-mode or single mode field squeezed states can be generated through coherent control on the dynamics of the system. The degree of squeezing and preparing time can be directly controlled through tuning the external classical fields. This protocol may offer a promising platform for implementing scalable on-chip quantum information processing with continuous variables.

Peng-Bo Li; Fu-Li Li

2010-02-26T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Natural orbits of atomic Cooper pairs in a nonuniform Fermi gas  

E-Print Network (OSTI)

We examine the basic mode structure of atomic Cooper pairs in an inhomogeneous Fermi gas. Based on the properties of Bogoliubov quasi-particle vacuum, the single particle density matrix and the anomalous density matrix share the same set of eigenfunctions. These eigenfunctions correspond to natural pairing orbits associated with the BCS ground state. We investigate these orbits for a Fermi gas in a spherical harmonic trap, and construct the wave function of a Cooper pair in the form of Schmidt decomposition. The issue of spatial quantum entanglement between constituent atoms in a pair is addressed.

Y. H. Pong; C. K. Law

2006-05-08T23:59:59.000Z

382

Qubits entanglement dynamics modified by an effective atomic environment  

E-Print Network (OSTI)

We study entanglement dynamics of a couple of two-level atoms resonantly interacting with a cavity mode and embedded in a dispersive atomic environment. We show that in the absence of the environment the entanglement reaches its maximum value when only one exitation is involved. Then, we find that the atomic environment modifies that entanglement dynamics and induces a typical collapse-revival structure even for an initial one photon Fock state of the field.

I. Sainz; A. B. Klimov; Luis Roa

2005-09-28T23:59:59.000Z

383

Utility of atomic kicked-rotor interferometers for precision measurements  

Science Conference Proceedings (OSTI)

We theoretically investigate a proposed scheme to use an atomic {delta}-kicked rotor resonance for high-precision measurements of accelerations and the photon recoil frequency. Although the technique offers rapid scaling of the measurement sensitivity with pulse number, it also features a high sensitivity to initial atomic momentum. We find that for realistic atom sources, the momentum sensitivity significantly limits the achievable precision. We consider several different variations on the technique, but find similar limitations in all cases.

Horne, R. A.; Leonard, R. H.; Sackett, C. A. [Physics Department, University of Virginia, Charlottesville, Virginia 22904 (United States)

2011-06-15T23:59:59.000Z

384

Hydrogen atom in phase space: The Wigner representation  

E-Print Network (OSTI)

We have found an effective method of calculating the Wigner function, being a quantum analogue of joint probability distribution of position and momentum, for bound states of nonrelativistic hydrogen atom. The formal similarity between the eigenfunctions of nonrelativistic hydrogen atom in the momentum representation and Klein-Gordon propagators has allowed the calculation of the Wigner function for an arbitrary bound state of the hydrogen atom. These Wigner functions for some low lying states are depicted and discussed.

L. Praxmeyer; J. Mostowski; K. Wodkiewicz

2005-04-06T23:59:59.000Z

385

Civilian Control of Atomic Energy, 1945-1946  

Office of Scientific and Technical Information (OSTI)

President Truman signs the Atomic Energy Act, creating the Atomic Energy Commission, August 1, 1946. Senator Brien McMahon is second from right. CIVILIAN CONTROL OF ATOMIC ENERGY President Truman signs the Atomic Energy Act, creating the Atomic Energy Commission, August 1, 1946. Senator Brien McMahon is second from right. CIVILIAN CONTROL OF ATOMIC ENERGY (1945-1946) Events > Postscript -- The Nuclear Age, 1945-Present Informing the Public, August 1945 The Manhattan Engineer District, 1945-1946 First Steps toward International Control, 1944-1945 Search for a Policy on International Control, 1945 Negotiating International Control, 1945-1946 Civilian Control of Atomic Energy, 1945-1946 Operation Crossroads, July 1946 The VENONA Intercepts, 1946-1980 The Cold War, 1945-1990 Nuclear Proliferation, 1949-present While negotiations on international control of the atom went nowhere and deteriorating relations between the United States and the Soviet Union ushered in the Cold War, a domestic debate took place over the long-term management of America’s nuclear program. As they did with international control, Vannevar Bush and James B. Conant took the initial lead. In September 1944, they proposed to Secretary of War Henry L. Stimson setting up postwar a civilian twelve-member atomic energy commission, with four members representing the military services, that would control not only large-scale production but also research involving minute amounts of material.

386

Atomic Reference Data for Electronic Structure Calculations - TMS  

Science Conference Proceedings (OSTI)

Feb 7, 2007 ... For this resource, data have been generated for atomic electronic structure calculations, to provide a standard reference for results of specified...

387

Nonlinear Atom Optics: Multi-wave mixing with matter waves  

Science Conference Proceedings (OSTI)

... 5. Hagley, EW et al. A well collimated quasi-continuous atom laser. ... It is this bosonic stimulation of scattering that mimics the stimulated emission of ...

1999-03-17T23:59:59.000Z

388

NNSA, Japan Atomic Energy Agency Mark 25 Years of Nonproliferation...  

National Nuclear Security Administration (NNSA)

safeguards systems has helped reduce the inspection burden on the International Atomic Energy Agency (IAEA) and its member states and improve the effectiveness and efficiency of...

389

NIST Atomic Physics Div. - 2005-2007: Strategic Focus 3  

Science Conference Proceedings (OSTI)

... in Atomic Data and Nuclear Data Tables. ... in temperature to deduce the energy depositedand ... determined by experiment and theory, would have ...

390

Atomic Energy Commission Explores Peaceful Uses of Nuclear Explosions...  

NLE Websites -- All DOE Office Websites (Extended Search)

Nuclear Explosions As part of the Plowshare program seeking to develop peaceful uses for nuclear explosives, the Atomic Energy Commission conducts the Sedan test at the Nevada...

391

International Atomic Energy Agency holds conference on fusion...  

NLE Websites -- All DOE Office Websites (Extended Search)

International Atomic Energy Agency holds conference on fusion roadmap By John Greenwald November 8, 2012 Tweet Widget Facebook Like Google Plus One Hutch Neilson, third from left,...

392

A Well Collimated Quasi-Continuous Atom Laser  

Science Conference Proceedings (OSTI)

... color (usually red), but the lamp emits white ... in strict cadence, while the light bulb emits waves ... ordinary atomic beams as lasers are from light bulbs. ...

393

Transmission of ultracold atoms through a micromaser: detuning effects  

E-Print Network (OSTI)

The transmission probability of ultracold atoms through a micromaser is studied in the general case where a detuning between the cavity mode and the atomic transition frequencies is present. We generalize previous results established in the resonant case (zero detuning) for the mesa mode function. In particular, it is shown that the velocity selection of cold atoms passing through the micromaser can be very easily tuned and enhanced using a non-resonant field inside the cavity. Also, the transmission probability exhibits with respect to the detuning very sharp resonances that could define single cavity devices for high accuracy metrology purposes (atomic clocks).

John Martin; Thierry Bastin

2004-12-06T23:59:59.000Z

394

Determination of sputtered atom densities and velocities via simulation  

Science Conference Proceedings (OSTI)

Transport of sputtered atoms in a plasma sputtering unit is simulated using two known elastic collision models. The methods of studying the collision of two atoms are isotropic random scattering angle in the center of mass frame and the so-called center to center collision model in which the impact parameter is ignored and the two particles collide such as two material points. The obtained results for the density and velocity of sputtered atoms in both models are compared with some experimental reports. This investigation shows that the copper and argon atoms present pointlike behavior in the collision process.

Khorram, S.; Sobhanian, S. [Faculty of Physics, University of Tabriz, Tabriz, 51666 (Iran, Islamic Republic of); Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, 51666 (Iran, Islamic Republic of); Naghshara, H. [Faculty of Physics, University of Tabriz, Tabriz, 51666 (Iran, Islamic Republic of)

2011-04-01T23:59:59.000Z

395

President Roosevelt Approves Production of Atomic Bomb | National...  

National Nuclear Security Administration (NNSA)

Approves Production of Atomic Bomb | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency...

396

Spatial chemical distance based on atomic property fields  

E-Print Network (OSTI)

009-9316-x Spatial chemical distance based on atomicSimilarity of compound chemical structures often leads tonot always true, as distinct chemical scaffolds can exhibit

Grigoryan, A. V.; Kufareva, I.; Totrov, M.; Abagyan, R. A.

2010-01-01T23:59:59.000Z

397

NIST Atomic Physics Div. - 2005-2007: Strategic Focus 1  

Science Conference Proceedings (OSTI)

... could be explored by photoassociating condensates of alkaline-earth atoms. ... Nanotubes, like the carbon tubes used in high-strength materials, are ...

398

The Manhattan Project: Making the Atomic Bomb. 1999 edition.  

Science Conference Proceedings (OSTI)

``The Manhattan Project: Making the Atomic Bomb`` is a short history of the origins and development of the American atomic bomb program during World War II. Beginning with the scientific developments of the pre-war years, the monograph details the role of the United States government in conducting a secret, nationwide enterprise that took science from the laboratory and into combat with an entirely new type of weapon. The monograph concludes with a discussion of the immediate postwar period, the debate over the Atomic Energy Act of 1946, and the founding of the Atomic Energy Commission.

Gosling, F.G.

1999-01-01T23:59:59.000Z

399

Exploiting Universality in Atoms with Large Scattering Lengths  

SciTech Connect

The focus of this research project was atoms with scattering lengths that are large compared to the range of their interactions and which therefore exhibit universal behavior at sufficiently low energies. Recent dramatic advances in cooling atoms and in manipulating their scattering lengths have made this phenomenon of practical importance for controlling ultracold atoms and molecules. This research project was aimed at developing a systematically improvable method for calculating few-body observables for atoms with large scattering lengths starting from the universal results as a first approximation. Significant progress towards this goal was made during the five years of the project.

Braaten, Eric

2012-05-31T23:59:59.000Z

400

Uses and Users of NIST's Atomic Spectra Database  

Science Conference Proceedings (OSTI)

Uses and Users of NIST's Atomic Spectra Database. ... statistics about how the database is being used. ... thermal sensors for military use and detectors ...

2013-04-10T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

SCIENCE ON SATURDAY-"Visualizing the Atomic World" | Princeton...  

NLE Websites -- All DOE Office Websites (Extended Search)

photo ID is necessary to gain access to the Laboratory for anyone over 18 years of age. "Visualizing the Atomic World" video platform video management video solutionsvideo...

402

Atomic Scale Investigation of Classical and Non-Classical Gamma ...  

Science Conference Proceedings (OSTI)

Direct experimental atomic scale evidence for such a mechanism will be ... Thermo-Kinetic Computer Simulation of Precipitation and Age-Hardening Effect in...

403

Atomic Level Calculations of Spall and Phase Transformations  

Science Conference Proceedings (OSTI)

Age Hardening and It's Effects on the Shock Response of Materials Alpha/ Omega Orientation Relationships and Habit Planes in Shocked Zr Atomic Level ...

404

Atomic Structure and its Change during Glass Transition of Metallic ...  

Science Conference Proceedings (OSTI)

In addition, we will discuss how the atomic structure evolves during glass transition ... Age Hardening of 7075 Alloy Processed by High-pressure Sliding ( HPS).

405

Atomic Scale Investigation on Precipitates in High Carbon Bearing ...  

Science Conference Proceedings (OSTI)

3 Dimensional Atom Probe analyses show concentration and distribution of ... The Effects of Nb and V Microalloying on Hardenability and Age Hardening in...

406

ATOMIC STRUCTURE OF PRECIPITATES IN A Mg-Re SYSTEM ...  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... ATOMIC STRUCTURE OF PRECIPITATES IN A Mg-Re SYSTEM ... Though the age hardening response in Mg-Nd is established for a long time...

407

Atomic City, Idaho: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Edit with form History Share this page on Facebook icon Twitter icon Atomic City, Idaho: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates...

408

The Application of Atom Probe Tomography to Oxide-Dispersion ...  

Science Conference Proceedings (OSTI)

Contributions of Atom Probe Tomography to the Understanding of Steels ... Investigation of the Microstructure-Property-Processing Relationships in a Series of...

409

Lithium atom interferometer using laser diffraction : description and experiments  

E-Print Network (OSTI)

We have built and operated an atom interferometer of the Mach-Zehnder type. The atomic wave is a supersonic beam of lithium seeded in argon and the mirrors and beam-splitters for the atomic wave are based on elastic Bragg diffraction on laser standing waves at 671 nm. We give here a detailed description of our experimental setup and of the procedures used to align its components. We then present experimental signals, exhibiting atomic interference effects with a very high visibility, up to 84.5 %. We describe a series of experiments testing the sensitivity of the fringe visibility to the main alignment defects and to the magnetic field gradient.

Alain Miffre; Marion Jacquey; Matthias Bchner; Grard Trenec; Jacques Vigue

2004-10-22T23:59:59.000Z

410

"Stationary Flowing Liquid Lithium System For Pumping Out Atomic...  

NLE Websites -- All DOE Office Websites (Extended Search)

Stationary Flowing Liquid Lithium System For Pumping Out Atomic Hydrogen Isotopes and Ions" Leonid E. Zakharov and Charles Gentile The system is comprised of a stationary closed...

411

Application of atomic magnetometry in magnetic particle detection  

Application of atomic magnetometry in magnetic particle detection S. Xu, a ! M. H. Donaldson, and A. Pines b ! Department of Chemistry , U niversity of California at ...

412

Scientists Report First Observation of an Atomic Air Force  

Science Conference Proceedings (OSTI)

... orbit but then very quickly decay back to the lower energy state by ... cubic arrangement of the atomic clusters changes as the intensity and frequency ...

2012-12-20T23:59:59.000Z

413

Nano- and Atomic-Scale Fracture - Programmaster.org  

Science Conference Proceedings (OSTI)

Mar 29, 2011 ... About this Symposium. Meeting, Materials Science & Technology 2011. Symposium, Nano- and Atomic-Scale Fracture. Sponsorship, MS&T...

414

Method of trivalent chromium concentration determination by atomic spectrometry  

DOE Patents (OSTI)

A method is disclosed for determining the concentration of trivalent chromium Cr(III) in a sample. The addition of perchloric acid has been found to increase the atomic chromium spectrometric signal due to Cr(III), while leaving the signal due to hexavalent chromium Cr(VI) unchanged. This enables determination of the Cr(III) concentration without pre-concentration or pre-separation from chromium of other valences. The Cr(III) concentration may be measured using atomic absorption spectrometry, atomic emission spectrometry or atomic fluorescence spectrometry.

Reheulishvili, Aleksandre N. (Tbilisi, 0183, GE); Tsibakhashvili, Neli Ya. (Tbilisi, 0101, GE)

2006-12-12T23:59:59.000Z

415

Bettis and Knolls Atomic Power Laboratories | National Nuclear...  

National Nuclear Security Administration (NNSA)

Bettis and Knolls Atomic Power Laboratories | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy...

416

Atomic Scale Modeling of Point Defects in Materials: Coupling Ab ...  

Science Conference Proceedings (OSTI)

Presentation Title, Atomic Scale Modeling of Point Defects in Materials: Coupling Ab Initio and Elasticity ... Electrochemical Shock of Lithium Battery Materials.

417

Atomic-resolution Chemical Analysis by Aberration-corrected ...  

Science Conference Proceedings (OSTI)

In fact, it is possible to analyze materials in the atomic resolution since both the ... State-of-the-art strain Microscopy for Ferroelectrics and Battery Materials.

418

In-situ Atomic Resolution Environmental TEM as Quantitative ...  

Science Conference Proceedings (OSTI)

Therefore, atomic-scale visualizing method by ETEM combined with the .... What Can We Learn from Measurements of Li-ion Battery Single Particles?

419

Optimization Online - Price of Anarchy for Non-atomic Congestion ...  

E-Print Network (OSTI)

Oct 17, 2013 ... Price of Anarchy for Non-atomic Congestion Games with Stochastic Demands. Chenlan Wang(chenlan.wang ***at*** warwick.ac.uk) Xuan Vinh...

420

Los Alamos Selected as Atomic Weapons Laboratory | National Nuclear...  

NLE Websites -- All DOE Office Websites (Extended Search)

Los Alamos Selected as Atomic Weapons Laboratory | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy...

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Los Alamos Selected as Atomic Weapons Laboratory | National Nuclear...  

National Nuclear Security Administration (NNSA)

Selected as Atomic Weapons Laboratory | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency...

422

Atomic Scale Imaging of Nanoscale Structures with Elemental ...  

Science Conference Proceedings (OSTI)

... for these materials, careful measurement of the position and identity of the various constituent atoms becomes essential. ... mml. Facilities/Tools Used: ...

2012-10-02T23:59:59.000Z

423

Computer Simulation of Materials at Atomic Level - TMS  

Science Conference Proceedings (OSTI)

Feb 8, 2007 ... CITATION: Deak, P., Frauenheim, T., Pederson, M.R., Computer Simulation of Materials at Atomic Level, John Wiley & Sons Canada 2000.

424

Single-cell atomic quantum memory for light  

E-Print Network (OSTI)

Recent experiments demonstrating atomic quantum memory for light [B. Julsgaard et al., Nature 432, 482 (2004)] involve two macroscopic samples of atoms, each with opposite spin polarization. It is shown here that a single atomic cell is enough for the memory function if the atoms are optically pumped with suitable linearly polarized light, and quadratic Zeeman shift and/or ac Stark shift are used to manipulate rotations of the quadratures. This should enhance the performance of our quantum memory devices since less resources are needed and losses of light in crossing different media boundaries are avoided.

Tomas Opatrny

2005-09-14T23:59:59.000Z

425

New Atomization Technology for Fine Amorphous Alloy Powder ...  

Science Conference Proceedings (OSTI)

However, the present conventional powder-making processes (gas and water atomization) seem difficult to reduce the price of amorphous alloy powders.

426

Atomic-Level Structure and Composition - Programmaster.org  

Science Conference Proceedings (OSTI)

Feb 15, 2010... Width by Atom Probe Tomography: Michael Miller1; Ai Serizawa1; 1ORNL ... a monochromated and aberration corrected TEM (Titan 80-300...

427

Albert Einstein Alerts President Roosevelt of German Atomic Energy...  

National Nuclear Security Administration (NNSA)

Albert Einstein Alerts President Roosevelt of German Atomic Energy Program | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation...

428

Atomic, Molecular and Optical Physics Group | Advanced Photon...  

NLE Websites -- All DOE Office Websites (Extended Search)

Atomic, Molecular and Optical Physics homeimg We seek a predictive understanding of intense x-ray and optical interactions with matter. We study new phenomena induced by intense...

429

ATOMIC BEAM STUDIES IN THE RHIC H-JET POLARIMETER.  

DOE Green Energy (OSTI)

The results of atomic beam production studies are presented. Improved cooling of the atoms before jet formation in the dissociator cold nozzle apparently reduces the atomic beam velocity spread and improves beam focusing conditions. A carefully designed sextupole separating (and focusing) magnet system takes advantage of the high brightness source. As a result a record beam intensity of a 12.4 {center_dot} 10{sup 16} atoms/s was obtained within 10 mm acceptance at the collision point. The results of the polarization dilution factor measurements (by the hydrogen molecules at the collision point) are also presented.

MAKDISI,Y.; ZELENSKI,A.; GRAHAM,D.; KOKHANOVSKI,S.; MAHLER,G.; NASS,A.; RITTER,J.; ZUBETS,V.; ET AL.

2005-01-28T23:59:59.000Z

430

NIST Ytterbium Atomic Clocks Set Record for Stability  

Science Conference Proceedings (OSTI)

... Ytterbium atoms are generated in an oven (large metal cylinder on the left) and sent to a vacuum chamber in the center of the photo to be ...

2013-08-22T23:59:59.000Z

431

Isotropically sensitive optical filter employing atomic resonance transitions  

DOE Patents (OSTI)

An ultra-high Q isotropically sensitive optical filter or optical detector employing atomic resonance transitions. More specifically, atomic resonance transitions utilized in conjunction with two optical bandpass filters provide an optical detector having a wide field of view (.about.2.pi. steradians) and very narrow acceptance bandwidth approaching 0.01 A. A light signal to be detected is transmitted through an outer bandpass filter into a resonantly absorbing atomic vapor, the excited atomic vapor then providing a fluorescence signal at a different wavelength which is transmitted through an inner bandpass filter. The outer and inner bandpass filters have no common transmission band, thereby resulting in complete blockage of all optical signals that are not resonantly shifted in wavelength by the intervening atomic vapor. Two embodiments are disclosed, one in which the light signal raises atoms contained in the atomic vapor from the ground state to an excited state from which fluorescence occurs, and the other in which a pump laser is used to raise the atoms in the ground state to a first excited state from which the light signal then is resonantly absorbed, thereby raising the atoms to a second excited state from which fluorescence occurs. A specific application is described in which an optical detector according to the present invention can be used as an underwater detector for light from an optical transmitter which could be located in an orbiting satellite.

Marling, John B. (Livermore, CA)

1981-01-01T23:59:59.000Z

432

Atomic Cu/Nb Interface Structures Characterized by Transmission ...  

Science Conference Proceedings (OSTI)

To understand the interface effect on mechanical behavior, atomic Cu/Nb interface structures were studied by (scanning) transmission electron microscopy ...

433

NIST: Atomic Reference Data for Electronic Structure Calc.  

Science Conference Proceedings (OSTI)

... We have generated data for atomic electronic structure calculations, to ... are presented here for total energies and orbital energy eigenvalues for ...

2011-12-09T23:59:59.000Z

434

Atomic Structural Evolution in Metallic Melts - Programmaster.org  

Science Conference Proceedings (OSTI)

This work will shed light on the understanding of atomic structures and thermal behavior of disordered materials, esp. glass transition, and will trigger more...

435

UNITED STATES ATOMIC ENERGY COMMISSION NEVADA OPERATIONS OFFICE  

Office of Legacy Management (LM)

UNITED STATES ATOMIC ENERGY COMMISSION NEVADA OPERATIONS OFFICE . MASTER .r NVO-152 DECEMBER 1974 Las Vegas, Nevada i, SUMMARY RIEPORT , . I ' i (ENTALNEVADTESTAREA...

436

Nuclear Reactor Materials at the Atomic Scale - Programmaster.org  

Science Conference Proceedings (OSTI)

Presentation Title, Nuclear Reactor Materials at the Atomic Scale ... Study of the Interaction of Solutes with Interfaces in Iron Using Density-Functional Theory.

437

Single-site addressing of ultracold atoms beyond the diffraction limit via position dependent adiabatic passage  

E-Print Network (OSTI)

We propose a single-site addressing implementation based on the sub-wavelength localization via adiabatic passage (SLAP) technique. We consider a sample of ultracold neutral atoms loaded into a two-dimensional optical lattice with one atom per site. Each atom is modeled by a three-level \\Lambda-system in interaction with a pump and a Stokes laser pulse. Using a pump field with a node in its spatial profile, the atoms at all sites are transferred from one ground state of the system to the other via stimulated Raman adiabatic passage, except the one at the position of the node that remains in the initial ground state. This technique allows for the preparation, manipulation, and detection of atoms with a spatial resolution better than the diffraction limit, which either relaxes the requirements on the optical setup used or extends the achievable spatial resolution to lattice spacings smaller than accessible to date. In comparison to techniques based on coherent population trapping, SLAP gives a higher addressing resolution and has additional advantages such as robustness against parameter variations, coherence of the transfer process, and the absence of photon induced recoil. Additionally, the advantages of our proposal with respect to adiabatic spin-flip techniques are highlighted. Analytic expressions for the achievable addressing resolution and efficiency are derived and compared to numerical simulations for Rb-87 atoms in state-of-the-art optical lattices.

Daniel Viscor; Juan Luis Rubio; Gerhard Birkl; Jordi Mompart; Vernica Ahufinger

2013-01-08T23:59:59.000Z

438

Antiproton low-energy collisions with Ps-atoms and true muonium atoms ($\\mu^+\\mu^-$)  

E-Print Network (OSTI)

Three-charge-particle collisions with participation of ultra-slow antiprotons ($\\bar{\\rm{p}}$) is the subject of this work. Specifically we compute the total cross sections and corresponding thermal rates of the following three-body reactions: $\\bar{\\rm p}+(e^+e^-) \\rightarrow \\bar{\\rm{H}} + e^-$ and $\\bar{\\rm p}+(\\mu^+\\mu^-) \\rightarrow \\bar{\\rm{H}}_{\\mu} + \\mu^-$, where $e^-(\\mu^-)$ is an electron (muon) and $e^+(\\mu^+)$ is a positron (antimuon) respectively, $\\bar{\\rm{H}}=(\\bar{\\rm p}e^+)$ is an antihydrogen atom and $\\bar{\\rm{H}}_{\\mu}=(\\bar{\\rm p}\\mu^+)$ is a muonic antihydrogen atom, i.e. a bound state of $\\bar{\\rm{p}}$ and $\\mu^+$. A set of two-coupled few-body Faddeev-Hahn-type (FH-type) equations is numerically solved in the framework of a modified close-coupling expansion approach.

Sultanov, Renat A

2013-01-01T23:59:59.000Z

439

Josephson effect in an atomic Fulde-Ferrell-Larkin-Ovchinnikov superfluid  

Science Conference Proceedings (OSTI)

We study theoretically two spatially separate quasi-one-dimensional atomic Fermi gases in a double-well trap. By tuning independently their spin polarizations, a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid or a Bardeen-Cooper-Schrieffer (BCS) superfluid may be formed in each well. We seek the possibility of creating a spatially tunable atomic Josephson junction between two superfluids, which is supposed to be realizable via building a weak link at given positions of the double-well barrier. We show that within mean-field theory the maximum Josephson current is proportional to the order parameter in two wells. Thus, the spatial inhomogeneity of the FFLO order parameter in one well may be directly revealed through the current measurement with the position-tunable link. We anticipate that this type of Josephson measurement can provide useful evidence for the existence of exotic FFLO superfluids. Possible experimental realizations of the Josephson measurements in atomic Fermi gases are discussed.

Hu Hui; Liu Xiaji [ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122 (Australia)

2011-01-15T23:59:59.000Z

440

Departments of Medicine and Statistics, Atomic Bomb Casualty Commission  

E-Print Network (OSTI)

More than 25 years after the atomic bombings of the Japanese cities of Hiroshima and Nagasaki, the late effects of radiation on the health of the survivors are still incompletely known. However, the Atomic Bomb Casualty Commission (ABCC) continues to monitor moribidity and mortality of A-bomb survivors. The ABCC is a binational endeavor; the parent organizations are the U.S. National

Joseph L. Belsky; Kiyoshi Tachikawa; Seymour Jablon

1973-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Quaternion atomic function wavelet for applications in image processing  

Science Conference Proceedings (OSTI)

Atomic Functions are widely used in different applications in image processing, pattern recognition, computational physics and also in the digital interpretation of signal measurements. The main contribution of this work is to develop a Quaternionic ... Keywords: 2D phase information, atomic functions, image processing, quaternion algebra

E. Ulises Moya-Snchez; Eduardo Bayro-Corrochano

2010-11-01T23:59:59.000Z

442

Measurements of Scattering Processes in Negative Ion- Atom Collisions  

DOE Green Energy (OSTI)

The main research activity is to study various scattering processes which occur in H{sup -} collisions with atomic (specifically, noble gas and atomic hydrogen) targets in the intermediate energy region. These processes include: elastic scattering, single- and double-electron detachment, and target excitation/ionization.

Kvale, T. J.

2000-12-22T23:59:59.000Z

443

Performance evaluation of Atomic Commit Protocols for mobile transactions  

Science Conference Proceedings (OSTI)

The commitment of a distributed transaction is ensured with the use of an Atomic Commit Protocol (ACP). Due to their great importance for transaction systems, the recent advances in mobile computing development have renewed the interest in the ... Keywords: atomic commit protocols, mobile ACPs, mobile databases, mobile networks, mobile transaction processing, performance evaluation, simulation, wireless networks

Nadia Nouali-Taboudjemat; Lynda Boukantar; Habiba Drias

2007-08-01T23:59:59.000Z

444

How fast can a distributed atomic read be?  

Science Conference Proceedings (OSTI)

This paper addresses the problem of designing an efficient implementation of a basic atomic read-write data structure over an asynchronous message-passing system. In particular, we consider time-efficient implementations of this abstraction in the case ... Keywords: atomic registers, shared-memory emulation, time-complexity

Partha Dutta; Rachid Guerraoui; Ron R. Levy; Arindam Chakraborty

2004-07-01T23:59:59.000Z

445

Feasibility and limitation of track studies using atomic force microscopy  

E-Print Network (OSTI)

Feasibility and limitation of track studies using atomic force microscopy D. Nikezic, J.P.Y. Ho, C.W.Y. Yip, V.S.Y. Koo, K.N. Yu * Department of Physics and Materials Science, City University of Hong Kong July 2002 Abstract Atomic force microscopy (AFM) has been employed to investigate characteristics

Yu, K.N.

446

Model Development for Atomic Force Microscope Stage Mechanisms  

E-Print Network (OSTI)

Model Development for Atomic Force Microscope Stage Mechanisms Ralph C. Smith and Andrew G. Hatch of the Philippines Virginia Commonwealth University Diliman, Quezon City 1101 Richmond VA 23284 rcdelros titanate (PZT) devices employed in atomic force microscope stage mechanisms. We focus specifically on PZT

447

Problems with Accurate Atomic Lfetime Measurements of Multiply Charged Ions  

SciTech Connect

A number of recent atomic lifetime measurements on multiply charged ions have reported uncertainties lower than 1%. Such a level of accuracy challenges theory, which is a good thing. However, a few lessons learned from earlier precision lifetime measurements on atoms and singly charged ions suggest to remain cautious about the systematic errors of experimental techniques.

Tr?bert, E

2009-02-19T23:59:59.000Z

448

Quantum Monte Carlo for atoms and molecules  

DOE Green Energy (OSTI)

The diffusion quantum Monte Carlo with fixed nodes (QMC) approach has been employed in studying energy-eigenstates for 1--4 electron systems. Previous work employing the diffusion QMC technique yielded energies of high quality for H{sub 2}, LiH, Li{sub 2}, and H{sub 2}O. Here, the range of calculations with this new approach has been extended to include additional first-row atoms and molecules. In addition, improvements in the previously computed fixed-node energies of LiH, Li{sub 2}, and H{sub 2}O have been obtained using more accurate trial functions. All computations were performed within, but are not limited to, the Born-Oppenheimer approximation. In our computations, the effects of variation of Monte Carlo parameters on the QMC solution of the Schroedinger equation were studied extensively. These parameters include the time step, renormalization time and nodal structure. These studies have been very useful in determining which choices of such parameters will yield accurate QMC energies most efficiently. Generally, very accurate energies (90--100% of the correlation energy is obtained) have been computed with single-determinant trail functions multiplied by simple correlation functions. Improvements in accuracy should be readily obtained using more complex trial functions.

Barnett, R.N.

1989-11-01T23:59:59.000Z

449

Using exotic atoms to keep borders safe  

Science Conference Proceedings (OSTI)

Muons, created by a particle accelerator, can be used to scan cargo for special nuclear materials (SNM). These muons exist long enough and are penetrating enough that they can be used to actively scan cargo to ensure the non-proliferation of SNM. A set of 'proof-of-concept' experiments have been performed to show that active muon analysis can be used. Experiments were performed at high intensity, medium energy particle accelerators (TRIUMF and PSI). Negative muons form exotic atoms with one electron replaced by the muon. Since the muon is captured in an excited state, it will give off x-rays which can be detected by high purity germanium detectors. These characteristic x-rays can be used to identify the nuclide. The muonic x-rays corresponding to the SNM of interest have been measured, even with the use of various shielding configurations composed of lead, iron, polyethylene, or fiberglass. These preliminary results show that muons can be successfully used to find shielded SNM. The safety of North Americans can be protected by the use of this technology.

Jason, A [Los Alamos National Laboratory; Miyadera, H [Los Alamos National Laboratory; Esch, E I [Los Alamos National Laboratory; Hoteling, N J [Los Alamos National Laboratory; Adelmann, A [Los Alamos National Laboratory; Heffner, R H [Los Alamos National Laboratory; Green, A [NON LANL; Olsthoorn, J [NON LANL; Stocki, T J [NON LANL

2010-01-01T23:59:59.000Z

450

Electron-impact ionization of atomic hydrogen  

DOE Green Energy (OSTI)

Since the invention of quantum mechanics, even the simplest example of collisional breakup in a system of charged particles, e{sup {minus}} + H {r_arrow} H{sup +} + e{sup {minus}} + e{sup {minus}}, has stood as one of the last unsolved fundamental problems in atomic physics. A complete solution requires calculating the energies and directions for a final state in which three charged particles are moving apart. Advances in the formal description of three-body breakup have yet to lead to a viable computational method. Traditional approaches, based on two-body formalisms, have been unable to produce differential cross sections for the three-body final state. Now, by using a mathematical transformation of the Schrodinger equation that makes the final state tractable, a complete solution has finally been achieved, Under this transformation, the scattering wave function can be calculated without imposing explicit scattering boundary conditions. This approach has produced the first triple differential cross sections that agree on an absolute scale with experiment as well as the first ab initio calculations of the single differential cross section.

Baertschy, Mark D.

2000-02-14T23:59:59.000Z

451

2010 Atomic & Molecular Interactions Gordon Research Conference  

SciTech Connect

The Atomic and Molecular Interactions Gordon Conferences is justifiably recognized for its broad scope, touching on areas ranging from fundamental gas phase and gas-condensed matter collision dynamics, to laser-molecule interactions, photophysics, and unimolecular decay processes. The meeting has traditionally involved scientists engaged in fundamental research in gas and condensed phases and those who apply these concepts to systems of practical chemical and physical interest. A key tradition in this meeting is the strong mixing of theory and experiment throughout. The program for 2010 conference continues these traditions. At the 2010 AMI GRC, there will be talks in 5 broadly defined and partially overlapping areas of intermolecular interactions and chemical dynamics: (1) Photoionization and Photoelectron Dynamics; (2) Quantum Control and Molecules in Strong Fields; (3) Photochemical Dynamics; (4) Complex Molecules and Condensed Phases; and (5) Clusters and Reaction Dynamics. These areas encompass many of the most productive and exciting areas of chemical physics, including both reactive and nonreactive processes, intermolecular and intramolecular energy transfer, and photodissociation and unimolecular processes. Gas phase dynamics, van der Waals and cluster studies, laser-matter interactions and multiple potential energy surface phenomena will all be discussed.

Todd Martinez

2010-07-23T23:59:59.000Z

452

Highly ionized atoms in tokamak discharges  

DOE Green Energy (OSTI)

Tokamak discharges are characterized by electron densities usually approximately 0.3 to 1.0 x 10/sup 14/ cm/sup -3/ and temperatures from a few hundred eV to several keV. In addition to the working gas (H or He), the plasma normally contains some light impurities (approximately 10/sup 12/ cm/sup -3/ O or C) that are completely stripped except at the outer periphery, and heavier elements from the vacuum wall and current-aperture limiter (Fe, Cr, Ni, W, Mo and others, approximately 10/sup 10/-10/sup 11/ cm/sup -3/) that remain partly stripped, hence relatively strongly radiating, throughout the discharge. Other elements, especially noble gases, may be deliberately added for diagnostic purposes. Resonance lines of Fe and Ar in the beryllium and lithium sequences, of Fe, Kr, and Mo in the magnesium and sodium sequences, and of Mo and Xe in the zinc and copper sequences have been used for rough determination of plasma composition. Since crucial plasma characteristics such as temperature and confinement time are sensitively affected by the local composition, it is essential to improve the available atomic data necessary for more accurate analysis: wavelengths, transition probabilities, excitation, ionization and recombination rates, especially for the heavier elements.

Hinnov, E.

1976-05-01T23:59:59.000Z

453

The New Element Californium (Atomic Number 98)  

DOE R&D Accomplishments (OSTI)

Definite identification has been made of an isotope of the element with atomic number 98 through the irradiation of Cm{sup 242} with about 35-Mev helium ions in the Berkeley Crocker Laboratory 60-inch cyclotron. The isotope which has been identified has an observed half-life of about 45 minutes and is thought to have the mass number 244. The observed mode of decay of 98{sup 244} is through the emission of alpha-particles, with energy of about 7.1 Mev, which agrees with predictions. Other considerations involving the systematics of radioactivity in this region indicate that it should also be unstable toward decay by electron capture. The chemical separation and identification of the new element was accomplished through the use of ion exchange adsorption methods employing the resin Dowex-50. The element 98 isotope appears in the eka-dysprosium position on elution curves containing berkelium and curium as reference points--that is, it precedes berkelium and curium off the column in like manner that dysprosium precedes terbium and gadolinium. The experiments so far have revealed only the tripositive oxidation state of eka-dysprosium character and suggest either that higher oxidation states are not stable in aqueous solutions or that the rates of oxidation are slow. The successful identification of so small an amount of an isotope of element 98 was possible only through having made accurate predictions of the chemical and radioactive properties.

Seaborg, G. T.; Thompson, S. G.; Street, K. Jr.; Ghiroso, A.

1950-06-19T23:59:59.000Z

454

Atomic Models for Motional Stark Effects Diagnostics  

DOE Green Energy (OSTI)

We present detailed atomic physics models for motional Stark effects (MSE) diagnostic on magnetic fusion devices. Excitation and ionization cross sections of the hydrogen or deuterium beam traveling in a magnetic field in collisions with electrons, ions, and neutral gas are calculated in the first Born approximation. The density matrices and polarization states of individual Stark-Zeeman components of the Balmer {alpha} line are obtained for both beam into plasma and beam into gas models. A detailed comparison of the model calculations and the MSE polarimetry and spectral intensity measurements obtained at the DIII-D tokamak is carried out. Although our beam into gas models provide a qualitative explanation for the larger {pi}/{sigma} intensity ratios and represent significant improvements over the statistical population models, empirical adjustment factors ranging from 1.0-2.0 must still be applied to individual line intensities to bring the calculations into full agreement with the observations. Nevertheless, we demonstrate that beam into gas measurements can be used successfully as calibration procedures for measuring the magnetic pitch angle through {pi}/{sigma} intensity ratios. The analyses of the filter-scan polarization spectra from the DIII-D MSE polarimetry system indicate unknown channel and time dependent light contaminations in the beam into gas measurements. Such contaminations may be the main reason for the failure of beam into gas calibration on MSE polarimetry systems.

Gu, M F; Holcomb, C; Jayakuma, J; Allen, S; Pablant, N A; Burrell, K

2007-07-26T23:59:59.000Z

455

DOE - Office of Legacy Management -- Gen_Atomics  

Office of Legacy Management (LM)

General Atomics Hot Cell Facility, California, Site General Atomics Hot Cell Facility, California, Site This Site All Sites All LM Quick Search Key Documents and Links All documents are Adobe Acrobat files. pdf_icon Key Documents General Atomics Hot Cell Facility, California, Site Fact Sheet Please be green. Do not print these documents unless absolutely necessary. Request a paper copy of any document by submitting a Document Request. All Site Documents All documents are Adobe Acrobat files. pdf_icon Fact Sheet Environmental Assessment Other Documents Fact Sheet General Atomics Hot Cell Facility, California, Site Fact Sheet December 12, 2011 Environmental Assessment Final Environmental Assessment for Decontaminating and Decommissioning the General Atomics Hot Cell Facility DOE/EA-1053 August 1995 Other Documents

456

News Release: Energy Department and International Atomic Energy Agency to  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

and International Atomic Energy and International Atomic Energy Agency to Host Remediation Workshop News Release: Energy Department and International Atomic Energy Agency to Host Remediation Workshop August 9, 2012 - 9:44am Addthis Energy Department and International Atomic Energy Agency to Host Remediation Workshop News Contact: Contractor, Judy Miller, S.M. Stoller Corporation Public Affairs (970) 248-6363 judy.miller@lm.doe.gov GRAND JUNCTION, Colo. - The U.S. Department of Energy and the International Atomic Energy Agency (IAEA) are hosting the International Workshop on Legacy Management and Regulatory Supervision of Uranium Legacy Sites from August 13 through 24 to exchange information and share examples of regulatory processes and case studies of site remediation, including post-remediation long-term care programs. Scientists, environmental

457

The Harnessed Atom - Student Edition | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

The Harnessed Atom - Student Edition The Harnessed Atom - Student Edition The Harnessed Atom - Student Edition The Harnessed Atom is a middle school science, technology, engineering, and math (STEM) curriculum extension that focuses on nuclear science and energy. It is designed to provide students with accurate, unbiased, and up-to-date information on the roles that energy and nuclear science play in our lives. The curriculum includes essential principles and fundamental concepts of energy science. This update is based on the original 1985 Harnessed Atom curriculum from the U.S. Department of Energy. It has been developed with extensive input from science teachers across the country in pilot test reviews and workshops, as well as technical reviews from scientists and experts at universities, professional societies, and national laboratories.

458

Institute for Atom-Efficient Chemical Transformations Energy Frontier  

NLE Websites -- All DOE Office Websites (Extended Search)

Institute for Atom-Efficient Chemical Transformations DOE Logo Institute for Atom-Efficient Chemical Transformations DOE Logo Focus Areas Reaction Mechanisms Controlled Active Metals Materials Synthesis Search Argonne ... Search Argonne Home > Institute for Atom-Efficient Chemical Transformations > IACT Home IACT News IACT Partners IACT Staff IACT Awards Publications & Presentations Jobs at IACT Energy Frontier Research Centers at Argonne Strategic Alliances Research Facilities & Tools Institute for Atom-Efficient Chemical Transformations - an Energy Frontier Research Center The Institute for Atom-Efficient Chemical Transformations (IACT) employs a multidisciplinary approach to address key catalytic conversions that could improve the efficiency of producing fuels from biomass. IACT focuses on advancing the science of catalysis for the efficient conversion of energy resources into usable forms. IACT's goal is to find ways to achieve control and efficiency of chemical conversions comparable to those in nature.

459

Energy Department and French Commission on Atomic Energy and Alternative  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy Department and French Commission on Atomic Energy and Energy Department and French Commission on Atomic Energy and Alternative Energies Sign New Research and Development Agreement Energy Department and French Commission on Atomic Energy and Alternative Energies Sign New Research and Development Agreement June 28, 2012 - 1:04pm Addthis Energy Department and French Commission on Atomic Energy and Alternative Energies Sign New Research and Development Agreement Washington, D.C. - On June 19, 2012, U.S. Energy Secretary Steven Chu and Dr. Bernard Bigot, Chairman of France's Commission on Atomic Energy and Alternative Energies (CEA), signed an agreement to help facilitate research and development (R&D) cooperation. The Agreement on Cooperation in Low-Carbon Energy Technologies will focus on a spectrum of advanced

460

President Roosevelt Approves Production of Atomic Bomb | National Nuclear  

National Nuclear Security Administration (NNSA)

Approves Production of Atomic Bomb | National Nuclear Approves Production of Atomic Bomb | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > President Roosevelt Approves Production of Atomic Bomb President Roosevelt Approves Production of Atomic Bomb January 19, 1942 Washington, DC President Roosevelt Approves Production of Atomic Bomb

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Spectral Emission of Moving Atom Exhibits always a Redshift  

E-Print Network (OSTI)

A renewed analysis of the H.E. Ives and G.R. Stilwell's experiment on moving hydrogen canal rays (J. Opt. Soc. Am., 1938, v.28, 215) concludes that the spectral emission of a moving atom exhibits always a redshift which informs not the direction of the atom's motion. The conclusion is also evident from a simple energy relation: atomic spectral radiation is emitted as an orbiting electron consumes a portion of its internal energy on transiting to a lower-energy state which however has in a moving atom an additional energy gain; this results in a redshift in the emission frequency. Based on auxiliary experimental information and a scheme for de Broglie particle formation, we give a vigorous elucidation of the mechanism for deceleration radiation of atomic electron; the corresponding prediction of the redshift is in complete agreement with the Ives and Stilwell's experimental formula.

Zheng-Johansson, J X

2006-01-01T23:59:59.000Z

462

Immersing carbon nano-tubes in cold atomic gases  

E-Print Network (OSTI)

We investigate the sympathetic relaxation of a free-standing, vibrating carbon nano-tube that is mounted on an atom chip and is immersed in a cloud of ultra-cold atoms. Gas atoms colliding with the nano-tube excite phonons via a Casimir-Polder potential. We use Fermi's Golden Rule to estimate the relaxation rates for relevant experimental parameters and develop a fully dynamic theory of relaxation for the multi-mode phononic field embedded in a thermal atomic reservoir. Based on currently available experimental data, we identify the relaxation rates as a function of atom density and temperature that are required for sympathetic ground state cooling of carbon nano-tubes.

C. T. Wei; P. V. Mironova; J. Fortgh; W. P. Schleich; R. Walser

2013-07-08T23:59:59.000Z

463

General Atomics Compliance Order, October 6, 1995 Summary  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

General Atomics General Atomics Agreement Name General Atomics Compliance Order, October 6, 1995 HWCA 95/96-017 State California Agreement Type Compliance Agreement Legal Driver(s) FFCAct Scope Summary Address LDR requirements pertaining to storage and treatment of covered waste at General Atomics Parties DOE; State of California Environmental Protection Agency (Department of Toxic Substances Control) Date 10/6/1995 SCOPE * Address LDR requirements pertaining to storage and treatment of covered waste at General Atomics. * Require adherence to the Site Treatment Plan which provides overall schedules for achieving compliance with LDR storage and treatment requirements based on milestones. ESTABLISHING MILESTONES * Respondent shall carry out all activities in accordance with the schedules and

464

Probing the Kondo lattice model with alkaline-earth-metal atoms  

Science Conference Proceedings (OSTI)

We study transport properties of alkaline-earth-metal atoms governed by the Kondo lattice Hamiltonian plus a harmonic confining potential, and suggest simple dynamical probes of several different regimes of the phase diagram that can be implemented with current experimental techniques. In particular, we show how Kondo physics at strong coupling, at low density, and in the heavy fermion phase is manifest in the dipole oscillations of the conduction band upon displacement of the trap center.

Foss-Feig, Michael [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); JILA, Boulder, Colorado 80309 (United States); Hermele, Michael [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); Rey, Ana Maria [Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); JILA, Boulder, Colorado 80309 (United States); NIST, Boulder, Colorado 80309 (United States)

2010-05-15T23:59:59.000Z

465

Strongly interacting quantum mixtures of ultracold atoms  

E-Print Network (OSTI)

This thesis describes the construction of a new apparatus for ultracold quantum gases as well as the scientific results this machine has produced so far. This new apparatus is capable of simultaneously cooling and trapping ...

Wu, Cheng-Hsun, Ph. D. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

466

Trapped Ions and Laser Cooling 11  

Science Conference Proceedings (OSTI)

... 2 GHz I ... monic well, eg, the absorption spectrum for the secular motion in an rf trap ... a sin- gle atom [mass of 100 u (atomic mass units)] starts from rest ...

2002-08-07T23:59:59.000Z

467

Radioactive Elements in the Standard Atomic Weights Table.  

Science Conference Proceedings (OSTI)

In the 1949 Report of the Atomic Weights Commission, a series of new elements were added to the Atomic Weights Table. Since these elements had been produced in the laboratory and were not discovered in nature, the atomic weight value of these artificial products would depend upon the production method. Since atomic weight is a property of an element as it occurs in nature, it would be incorrect to assign an atomic weight value to that element. As a result of that discussion, the Commission decided to provide only the mass number of the most stable (or longest-lived) known isotope as the number to be associated with these entries in the Atomic Weights Table. As a function of time, the mass number associated with various elements has changed as longer-lived isotopes of a particular element has been found in nature, or as improved half-life values of an element's isotopes might cause a shift in the longest-lived isotope from one mass to another. In the 1957 Report of the Atomic Weights Commission, it was decided to discontinue the listing of the mass number in the Atomic Weights Table on the grounds that the kind of information supplied by the mass number is inconsistent with the primary purpose of the Table, i.e., to provide accurate values of 'these constants' for use in various chemical calculations. In addition to the Table of Atomic Weights, the Commission included an auxiliary Table of Radioactive Elements for the first time, where the entry would be the isotope of that element which was the most stable, i.e., the one with the longest known half-life. In their 1973 Report, the Commission noted that the users of the main Table of Atomic Weights were dissatisfied with the omission of values for some elements in that Table and it was decided to reintroduce the mass number for the radioactive elements into the main Table. In their 1983 Report, the Commission decided that radioactive elements were considered to lack a characteristic terrestrial isotopic composition, from which an atomic weight value could be calculated to five or more figure accuracy, without prior knowledge of the sample involved. These elements were again listed in the Atomic Weights Table with no further information, i.e., with no mass number or atomic weight value.

Holden,N.E.

2007-08-04T23:59:59.000Z

468

The Chemi-Ionization Processes in Slow Collisions of Rydberg Atoms with Ground State Atoms: Mechanism and Applications  

E-Print Network (OSTI)

In this article the history and the current state of research of the chemiionization processes in atom-Rydberg atom collisions is presented. The principal assumptions of the model of such processes based on the dipole resonance mechanism, as well as the problems of stochastic ionization in atom-Rydberg atom collisions, are exposed. The properties of the collision kinetics in atom beams of various types used in contemporary experimentations are briefly described. Results of the calculation of the chemi-ionization rate coefficients are given and discussed for the range of the principal quantum number values 5 chemi-ionization processes in astrophysical and laboratory low-temperature plasmas, and the contemporary methods of their investigation are described. Also the directions of further research of chemi-ionization processes are discussed in this article.

Mihajlov, A A; Ignjatovic, Lj M; Klyucharev, A N; 10.1007/s10876-011-0438-7

2012-01-01T23:59:59.000Z

469

Accelerating universe, WEP violation and antihydrogen atoms  

E-Print Network (OSTI)

Apart from the suspected violation of the CPT invariance, we might expect if the measurements of antihydrogen atoms provide testing Weak Equivalence Principle (WEP) in the gravitational phenomena. We start with how its violation can be related to the expected idea of unification of particle physics and gravitation, an attempt beyond the standard theories, including general relativity of Einstein. A particular emphasis will be placed on the issue of an accelerating universe, a rather recent development since nearly 10 years ago, suggesting a strong motivation toward attempts beyond the conventional concepts of the traditional cosmology. We face today's version of the cosmological constant problem. A candidate of the new ingredient appears to be provided by a scalar field, sometimes under the names like quintessence or dark-energy. In this article, we discuss the subject from a point of view of a more theoretical approach based on the scalar-tensor theory of gravitation. By exploiting the concepts of conformal transformations and conformal frames unique to this type of approach, we show that a successful understanding of the observed cosmological acceleration entails an unexpected outcome of breakdown of WEP, which may show up as a distinct behavior between hydrogen and antihydrogen in the gravitational influence, from a further wider perspective including a vector field as well. We intended to introduce most of the new concepts as plainly and briefly as possible, according to the nature of the talk. On the other hand, however, we find it also useful to go into some more details, depending on the interests of individuals among the audience. For a compromise, we decided to add a number of footnotes which were not delivered during the presentation, but might be helpful in the proceedings published later.

Yasunori Fujii

2008-03-21T23:59:59.000Z

470

Questions and Answers - How do I make a model of an atom?  

NLE Websites -- All DOE Office Websites (Extended Search)

What is an atom? Whatare atoms made of? What is an atom? What<br>are atoms made of? Previous Question (What is an atom? What are atoms made of?) Questions and Answers Main Index Next Question (An example of indirect evidence used to study atoms?) An example of indirect evidenceused to study atoms? How do I make a model of an atom? Do you need to make a model or a drawing of an atom for science class? If so, follow these instructions to learn where all of the atom's pieces go. Step 1 - Gather Information Before you can build your model, you will need to know how many protons, neutrons and electrons your atom has. If you do not already know how to use the Periodic Table of Elements to find this information, read the 'How many protons, electrons and neutrons are in an atom of...?' page to learn how.

471

Proceedings of the workshop on opportunities for atomic physics using slow, highly-charged ions  

SciTech Connect

The study of atomic physics with highly-charged ions is an area of intense activity at the present time because of a convergence of theoretical interest and advances in experimental techniques. The purpose of the Argonne ''Workshop on Opportunities for Atomic Physics Using Slow, Highly-Charged Ions'' was to bring together atomic, nuclear, and accelerator physicists in order to identify what new facilities would be most useful for the atomic physics community. The program included discussion of existing once-through machines, advanced ion sources, recoil ion techniques, ion traps, and cooler rings. One of the topics of the Workshop was to discuss possible improvement to the ANL Tandem-Linac facility (ATLAS) to enhance the capability for slowing down ions after they are stripped to a high-charge state (the Accel/Decel technique). Another topic was the opportunity for atomic physics provided by the ECR ion source which is being built for the Uranium Upgrade of ATLAS. 18 analytics were prepared for the individual papers in this volume.

Not Available

1987-01-01T23:59:59.000Z

472

Free fermion antibunching in a degenerate atomic Fermi gas released from an optical lattice  

E-Print Network (OSTI)

Noise in a quantum system is fundamentally governed by the statistics and the many-body state of the underlying particles. Whereas for bosonic particles the correlated noise observed for e.g. photons or bosonic neutral atoms can still be explained within a classical field description with fluctuating phases, the anticorrelations in the detection of fermionic particles have no classical analogue. The observation of such fermionic antibunching is so far scarce and has been confined to electrons and neutrons. Here we report on the first direct observation of antibunching of neutral fermionic atoms. Through an analysis of the atomic shot noise in a set of standard absorption images, of a gas of fermionic 40K atoms released from an optical lattice, we find reduced correlations for distances related to the original spacing of the trapped atoms. The detection of such quantum statistical correlations has allowed us to characterise the ordering and temperature of the Fermi gas in the lattice. Moreover, our findings are an important step towards revealing fundamental fermionic many-body quantum phases in periodic potentials, which are at the focus of current research.

T. Rom; Th. Best; D. van Oosten; U. Schneider; S. Foelling; B. Paredes; I. Bloch

2006-11-21T23:59:59.000Z

473

The Dynamic Space of General Relativity in Second Atomization  

E-Print Network (OSTI)

The notion that the geometry of our space-time is not only a static background but can be physically dynamic is well established in general relativity. Geometry can be described as shaped by the presence of matter, where such shaping manifests itself as gravitational force. We consider here probabilistic or atomistic models of such space-time, in which the active geometry emerges from a statistical distribution of 'atoms'. Such atoms are not to be confused with their chemical counterparts, however the shift of perspective obtained in analyzing a gas via its molecules rather than its bulk properties is analogous to this "second atomization". In this atomization, space-time itself (i.e. the meter and the second) is effectively atomized, so the atoms themselves must exist in a 'subspace'. Here we build a simple model of such a space-time from the ground up, establishing a route for more complete theories, and enabling a review of recent work. We first introduce the motivation behind statistical interpretations and atomism, and look at applications to the realm of dynamic space-time theories. We then consider models of kinetic media in subspace compatible with our understanding of light. From the equations governing the propagation of light in subspace we can build a metric geometry, describing the dynamic and physical space-time of general relativity. Finally, implications of the theory on current frontiers of general relativity including cosmology, black holes, and quantum gravity are discussed.

Lukas A. Saul

2004-05-26T23:59:59.000Z

474

Atoms.inp Archive: Crystallographic Data from GSECARS  

DOE Data Explorer (OSTI)

The Atoms.inp Archive is a collection of crystallographic data for use in XAFS analysis. The crystallographic data is stored as atoms.inp files, which contain all the information necessary to describe the crystal, and can be used by the program ATOMS to generate feff.inp files. These files can then be used by the FEFF program [See http://leonardo.phys.washington.edu/feff/] to calculate a theoretical XAFS spectrum for the crystal. This archive exists because it can take a considerable amount of time to locate a suitable reference for a model structure to use for making theoretical XAFS standards. Even then, references sometimes give non-standard or incomplete crystallographic notation that ATOMS has difficulty interpreting. All of this means that getting a reliable atoms.inp file can take quite a bit of effort. It is hoped that this collection of well-documented and well-tested atoms.inp files will eliminate much of the work in creating theoretical XAFS standards from FEFF. [Taken from http://cars9.uchicago.edu/~newville/adb/]. The collection currently has more than 200 crystal structures, 2748 data files, and it continues to expand. The collection is related to the UWXAFS Project [http://depts.washington.edu/uwxafs/] and to the work of the Consortium for Advanced Radiation Sources (CARS). After searching the Archive, a user may also choose to run the web version of ATOMS software.

Newville, Matthew

475

Study of atomic physics and population inversions with plasma focus  

SciTech Connect

The plasma focus can be used to generate high temperature and high density plasmas. Neon-like plasmas have previously been studied in Z-pinches and laser produced plasmas as sources for XUV and x-ray lasers. The plasma focus provides a simple and inexpensive source for studying atomic physics of highly ionized atoms. A detailed understanding of atomic physics at high temperatures, densities, and megagauss magnetic fields is necessary for possible x-ray laser designs. Methods that are generally used for obtaining population inversions include collisional ionization of the inner shells of multi-electron atoms and ions, photoexcitation, and electron collisional excitation of ions, collisional combination of ions, and atom-ion resonant charge exchange. We will discuss some possible experiments to help understand the atomic physics under the above condition. Some ideas and calculations will be given to show the feasibility of doing atomic physics relating to x-ray lasers with a plasma focus. 13 refs., 2 figs.

Oona, H.; Hodgdon, M.L.; Rickel, D.G.; Freeman, B.L.

1989-01-01T23:59:59.000Z

476

Sensor for measuring the atomic fraction in highly dissociated hydrogen  

DOE Green Energy (OSTI)

Atomic hydrogen is a very important constituent for processes ranging from cleaning oxide from GaAs and annealing amorphous silicon to the deposition of diamond. Because the usual techniques for measuring atomic fraction are either expensive and cumbersome to use, or unsuitable for application to highly dissociated hydrogen, a specially designed sensor was developed. Sensor design is based on a diffusion tube with noncatalytic walls, having one end open to the atom source and a catalytic closure at the other end. The sensor is simple and inexpensive to fabricate, and determining atom density is straightforward. Sensor design also inhibits thermal runaway, which occurs when atom density is high enough to impart enough recombination energy to the non-catalytic surface to substantially raise its temperature. While recombination coefficients for such surfaces are very low near room temperature, they increase nearly exponentially with temperature unless actively cooled. With the use of a straightforward calibration scheme to determine the variation in species fraction along the diffusion tube, the atomic fraction at the tube opening is determined. Design strategy, implementation considerations, and calibration method are presented. In addition, data obtained from an atomic hydrogen source are compared to relevant published data.

Gardner, W.L.

1994-12-31T23:59:59.000Z

477

Quantization of the Atom plus Attempting to Answer Heilbron & Kuhn  

E-Print Network (OSTI)

The idea of atoms is old but X-rays provided the first probe into the physical atom. Photographs of X-ray scattering from crystals -Laue spots- were the first visual proof for the physical existence of atoms arranged in a perfect geometric pattern. Thereby conclusively established the stability and physical reality of atoms. The Braggs developed Laue technique to study atoms. Moseley applied (Bragg) X-ray spectroscopy to determine the nuclear charge number of Rutherford atom. We argue that Bohr also at Manchester and contemporary of Moseley likely was inspired by Laue discovery to get busy with the mechanics of the nuclear atom. Roentgens discovery was awarded the first Nobel prize ever in 1901, Laue was honored in 1914, the Braggs in 1915, making Lawrence Bragg then at 25 the youngest ever. Eleven of the cited authors (Bohr himself included) in the trilogy (but not Nicholson the most cited), were later recognized by ten Noble prize awards, seven Laureates in physics and four in chemistry. The ensuing synergy...

Jeong, Yeuncheol; Datta, Timir

2013-01-01T23:59:59.000Z

478

Atomic clock transitions in silicon-based spin qubits  

E-Print Network (OSTI)

A major challenge in using spins in the solid state for quantum technologies is protecting them from sources of decoherence. This can be addressed, to varying degrees, by improving material purity or isotopic composition for example, or active error correction methods such as dynamic decoupling, or even combinations of the two. However, a powerful method applied to trapped ions in the context of frequency standards and atomic clocks, is the use of particular spin transitions which are inherently robust to external perturbations. Here we show that such `clock transitions' (CTs) can be observed for electron spins in the solid state, in particular using bismuth donors in silicon. This leads to dramatic enhancements in the electron spin coherence time, exceeding seconds. We find that electron spin qubits based on CTs become less sensitive to the local magnetic environment, including the presence of 29Si nuclear spins as found in natural silicon. We expect the use of such CTs will be of additional importance for donor spins in future devices, mitigating the effects of magnetic or electric field noise arising from nearby interfaces.

Gary Wolfowicz; Alexei M. Tyryshkin; Richard E. George; Helge Riemann; Nikolai V. Abrosimov; Peter Becker; Hans-Joachim Pohl; Mike L. W. Thewalt; Stephen A. Lyon; John J. L. Morton

2013-01-28T23:59:59.000Z

479

Argonne CNM Highlight: Atomic Scale Modeling and Simulation of Silicon  

NLE Websites -- All DOE Office Websites (Extended Search)

Atomic Scale Modeling and Simulation of Silicon Anisotropic Etching Atomic Scale Modeling and Simulation of Silicon Anisotropic Etching N. Moldovan A well-known process in microelectromechanical systems (MEMS) technology involves etching silicon in alkaline solutions, which produces accurate 3-D silicon structures, sometimes with atomic smoothness, by taking advantage of the strong dependence of the etching rate on crystal orientation. Significant experimental effort has been made to characterize this anisotropy (polar etching rate diagrams, temperature dependencies, roughness measurements, in situ STM records during etching, electrochemistry studies etc.). The experimental results were used in complex simulations that successfully predicted the evolution of the 3-D geometry, starting from the experimentally measured etching diagrams.

480

DOE - Office of Legacy Management -- Bettis Atomic Power Laboratories - PA  

Office of Legacy Management (LM)

Bettis Atomic Power Laboratories - Bettis Atomic Power Laboratories - PA 44 FUSRAP Considered Sites Site: Bettis Atomic Power Laboratories (PA.44 ) Eliminated from further consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Allegheny County , West Mifflin , Pennsylvania PA.44-1 Evaluation Year: Circa 1987 PA.44-2 Site Operations: Conducted activities directed toward the design, development, testing, and operational follow of nuclear reactor propulsion plants for Naval surface and submarine vessels. PA.44-1 Site Disposition: Eliminated - Active DOE facility PA.44-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Radioactive Materials Associated with Reactor Operation PA.44-3 Radiological Survey(s): None Indicated

Note: This page contains sample records for the topic "trap atoms atom" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Supersolid phase in atomic gases with magnetic dipole interaction  

SciTech Connect

A major obstacle for the experimental realization of a supersolid phase with cold atomic gases in an optical lattice is the weakness of the nearest-neighbor interactions achievable via magnetic dipole-dipole interactions. In this paper, we show that by using a large filling of atoms within each well, the characteristic energy scales are strongly enhanced. Within this regime, the system is well described by the rotor model, and the qualitative behavior of the phase diagram derives from mean-field theory. We find a stable supersolid phase for realistic parameters with chromium atoms.

Buehler, Adam; Buechler, Hans Peter [Institute for Theoretical Physics III, University of Stuttgart, Pfaffenwaldring 57, D-70550 (Germany)

2011-08-15T23:59:59.000Z

482

USE OF ATOMIC LAYER DEPOSITION OF FUNCTIONALIZATION OF NANOPOROUS BIOMATERIALS  

Science Conference Proceedings (OSTI)

Due to its chemical stability, uniform pore size, and high pore density, nanoporous alumina is being investigated for use in biosensing, drug delivery, hemodialysis, and other medical applications. In recent work, we have examined the use of atomic layer deposition for coating the surfaces of nanoporous alumina membranes. Zinc oxide coatings were deposited on nanoporous alumina membranes using atomic layer deposition. The zinc oxide-coated nanoporous alumina membranes demonstrated antimicrobial activity against Escherichia coli and Staphylococcus aureus bacteria. These results suggest that atomic layer deposition is an attractive technique for modifying the surfaces of nanoporous alumina membranes and other nanostructured biomaterials.

Brigmon, R.; Narayan, R.; Adiga, S.; Pellin, M.; Curtiss, L.; Stafslien, S.; Chisholm, B.; Monteiro-Riviere, N.; Elam, J.

2010-02-08T23:59:59.000Z

483

Spontaneous emission of an atom near a wedge  

E-Print Network (OSTI)

It is a well known fact that non-trivial boundary conditions affect the interaction between atoms and the always present quantized electromagnetic field. In this paper, we focus on how the spontaneous emission rate of a given excited atom is altered when placed inside a perfectly conducting wedge. We begin by briefly presenting the formalism on which our calculations are founded, proceeding then to a long but straightforward calculation of the transition rate. We present results for a general atom but, for the sake of simplicity, we narrow them down to an effective two-level system in our numerical investigations. From these we conclude that the results are physically sound.

F. S. S. Rosa; T. N. C. Mendes; A. Tenorio; C. Farina

2008-01-15T23:59:59.000Z

484

1978 bibliography of atomic and molecular processes. [Bibliography  

Science Conference Proceedings (OSTI)

This annotated bibliography lists 2557 works on atomic and molecular processes reported in publications dated 1978. Sources include scientific journals, conference proceedings, and books. Each entry is designated by one or more of the 114 categories of atomic and molecular processes used by the Controlled Fusion Atomic Data Center to classify data. Also indicated is whether the work was experimental or theoretical, what energy range was covered, what reactants were investigated, and the country of origin of the first author. Following the bibliographical listing are indexes of reactants and authors.

Not Available

1980-03-01T23:59:59.000Z

485

Time-dependent, lattice approach to atomic collisions  

DOE Green Energy (OSTI)

Recent progress in developing and applying methods of direct numerical solution of atomic collision problems is described. Various forms of the three-body problem are used to illustrate these techniques. Specifically, the process of ionization in proton-, antiproton-, and electron-impact of atomic hydrogen is considered in applications ranging in computational intensity from collisions simulated in two spatial dimensions to treatment of the three-dimensional, fully correlated two-electron Schroedinger equation. These examples demonstrate the utility and feasibility of treating strongly interacting atomic systems through time-dependent, lattice approaches.

Schultz, D.R. [Oak Ridge National Lab., TN (United States). Physics Div.

1995-12-31T23:59:59.000Z

486

Alignment and orientation in ion/endash/atom collisions  

DOE Green Energy (OSTI)

Recent progress in the theoretical study of alignment and orientation in atom-atom and ion-atom collisions at intermediate energies is reviewed. Recent systematic studies of the alignment and orientation of electronic charge cloud distributions of excited states resulting from such collisions clearly have provided more detailed information about the underlying collision dynamics. However, since accurate determination of these parameters is quite difficult, both theoretically and experimentally, a close collaboration between theory and experiment is necessary for a deeper understanding of the collision dynamics. A more complete approach, where the full density matrix is determined, is also discussed.

Kimura, M.; Lane, N.F.

1987-01-01T23:59:59.000Z

487

SPARC: The Stored Particle Atomic Research Collaboration At FAIR  

Science Conference Proceedings (OSTI)

The future international accelerator Facility for Antiproton and Ion Research (FAIR) encompasses 4 scientific pillars containing at this time 14 approved technical proposals worked out by more than 2000 scientists from all over the world. They offer a wide range of new and challenging opportunities for atomic physics research in the realm of highly-charged heavy ions and exotic nuclei. As one of the backbones of the Atomic, Plasma Physics and Applications (APPA) pillar, the Stored Particle Atomic Physics Research Collaboration (SPARC) has organized tasks and activities in various working groups for which we will present a concise survey on their current status.

Stoehlker, Th. [Helmholtz-Zentrum fuer Schwerionenforschung GSI, Darmstadt (Germany); Helmholtz-Institut Jena, Jena (Germany); Physikalisches Institut, Ruprecht-Karls Universitaet Heidelberg (Germany); ExtreMe Matter Institute EMMI and Research Division, Helmholtz-Zentrum fuer Schwerionenforschung GSI, Darmstadt (Germany); Beyer, H. F.; Braeuning-Demian, A.; Brandau, C.; Herfurth, F.; Kozhuharov, Ch.; Kuehl, Th.; Liesen, D.; Litvinov, Yu.; Noertershaeuser, W.; Kester, O.; Quint, W.; Spillmann, U.; Winters, D. [Helmholtz-Zentrum fuer Schwerionenforschung GSI, Darmstadt (Germany); Gumberidze, A. [ExtreMe Matter Institute EMMI and Research Division, Helmholtz-Zentrum fuer Schwerionenforschung GSI, Darmstadt (Germany); Frankfurt Institute for Advanced Studies FIAS, Johann Wolfgang Goethe Universitaet Frankfurt (Germany); Grisenti, R. E.; Petridis, N. [Institut fuer Kernphysik, Johann Wolfgang Goethe Universitaet Frankfurt (Germany); Hagmann, S. [Helmholtz-Zentrum fuer Schwerionenforschung GSI, Darmstadt (Germany); Institut fuer Kernphysik, Johann Wolfgang Goethe Universitaet Frankfurt (Germany); Maertin, R. [Helmholtz-Zentrum fuer Schwerionenforschung GSI, Darmstadt (Germany); Physikalisches Institut, Ruprecht-Karls Universitaet Heidelberg (Germany); Schramm, U. [FZD Forschungszentrum Dresden- Rossendorf (Germany)

2011-06-01T23:59:59.000Z

488

Finding New Thermoelectric Compounds Using Crystallographic Data: Atomic Displacement Parameters  

DOE Green Energy (OSTI)

A new structure-property relationship is discussed which links atomic displacement parameters (ADPs) and the lattice thermal conductivity of clathrate-like compounds. For many clathrate-like compounds, in which one of the atom types is weakly bound and ''rattles'' within its atomic cage, room temperature ADP information can be used to estimate the room temperature lattice thermal conductivity, the vibration frequency of the ''rattler'', and the temperature dependence of the heat capacity. Neutron data and X-ray crystallography data, reported in the literature, are used to apply this analysis to several promising classes of thermoelectric materials.

Chakoumakos, B.C.; Mandrus, D.G.; Sales, B.C.; Sharp, J.W.

1999-08-29T23:59:59.000Z

489

Effect of Temperature on NOx Reduction by Nitrogen Atom Injection  

DOE Green Energy (OSTI)

Chemical reduction of NO{sub x} can be accomplished by injection of nitrogen atoms into the diesel engine exhaust stream. The nitrogen atoms can be generated from a separate stream of pure N{sub 2} by means of plasma jets or non-thermal plasma reactors. This paper examines the effect of exhaust temperature on the NO{sub x} reduction efficiency that can be achieved by nitrogen atom injection. It is shown that to achieve a high NO{sub x} reduction efficiency at a reasonable power consumption penalty, the exhaust temperature needs to be 100 C or less.

Penetrante, B

1999-10-28T23:59:59.000Z

490

Manipulation of Single Neutral Atoms in Optical Lattices  

E-Print Network (OSTI)

We analyze a scheme to manipulate quantum states of neutral atoms at individual sites of optical lattices using focused laser beams. Spatial distributions of focused laser intensities induce position-dependent energy shifts of hyperfine states, which, combined with microwave radiation, allow selective manipulation of quantum states of individual target atoms. We show that various errors in the manipulation process are suppressed below $10^{-4} $ with properly chosen microwave pulse sequences and laser parameters. A similar idea is also applied to measure quantum states of single atoms in optical lattices.

Chuanwei Zhang; S. L. Rolston; S. Das Sarma

2006-05-29T23:59:59.000Z

491

Bulk and surface controlled diffusion of fission gas atoms  

Science Conference Proceedings (OSTI)

Fission gas retention and release impact nuclear fuel performance by, e.g., causing fuel swelling leading to mechanical interaction with the clad, increasing the plenum pressure and reducing the gap thermal conductivity. All of these processes are important to understand in order to optimize operating conditions of nuclear reactors and to simulate accident scenarios. Most fission gases have low solubility in the fuel matrix, which is especially pronounced for large fission gas atoms such as Xe and Kr, and as a result there is a significant driving force for segregation of gas atoms to extended defects such as grain boundaries or dislocations and subsequently for nucleation of gas bubbles at these sinks. Several empirical or semi-empirical models have been developed for fission gas release in nuclear fuels, e.g. [1-6]. One of the most commonly used models in fuel performance codes was published by Massih and Forsberg [3,4,6]. This model is similar to the early Booth model [1] in that it applies an equivalent sphere to separate bulk UO{sub 2} from grain boundaries represented by the sphere circumference. Compared to the Booth model, it also captures trapping at grain boundaries, fission gas resolution and it describes release from the boundary by applying timedependent boundary conditions to the circumference. In this work we focus on the step where fission gas atoms diffuse from the grain interior to the grain boundaries. The original Massih-Forsberg model describes this process by applying an effective diffusivity divided into three temperature regimes. In this report we present results from density functional theory calculations (DFT) that are relevant for the high (D{sub 3}) and intermediate (D{sub 2}) temperature diffusivities of fission gases. The results are validated by making a quantitative comparison to Turnbull's [8-10] and Matzke's data [12]. For the intrinsic or high temperature regime we report activation energies for both Xe and Kr diffusion in UO{sub 2{+-}x}, which compare favorably to available experiments. This is an extension of previous work [13]. In particular, it applies improved chemistry models for the UO{sub 2{+-}x} nonstoichiometry and its impact on the fission gas activation energies. The derivation of these models follows the approach that used in our recent study of uranium vacancy diffusion in UO{sub 2} [14]. Also, based on the calculated DFT data we analyze vacancy enhanced diffusion mechanisms in the intermediate temperature regime. In addition to vacancy enhanced diffusion we investigate species transport on the (111) UO{sub 2} surface. This is motivated by the formation of small voids partially filled with fission gas atoms (bubbles) in UO{sub 2} under irradiation, for which surface diffusion could be the rate-limiting transport step. Diffusion of such bubbles constitutes an alternative mechanism for mass transport in these materials.

Andersson, Anders D. [Los Alamos National Laboratory

2012-08-09T23:59:59.000Z

492

Tunable dipolar resonances and Einstein-de Haas effect in a {sup 87}Rb-atom condensate  

Science Conference Proceedings (OSTI)

We theoretically study a spinor condensate of {sup 87}Rb atoms in a F=1 hyperfine state confined in an optical dipole trap. Putting initially all atoms in an m{sub F}=1, component we observe a significant transfer of atoms to other, initially empty Zeeman states exclusively due to dipolar forces. Because of conservation of a total angular momentum the atoms going to other Zeeman components acquire an orbital angular momentum and circulate around the center of the trap. This is a realization of the Einstein-de Haas effect in a system of cold gases. We show that the transfer of atoms via dipolar interactions is possible only when the energies of the initial and the final sates are equal. This condition can be fulfilled utilizing a resonant external magnetic field, which tunes energies of involved states via the linear Zeeman effect. We found that there are many final states of different spatial density, which can be tuned selectively to the initial state. We show a simple model explaining high selectivity and controllability of weak dipolar interactions in the condensate of {sup 87}Rb atoms.

Swislocki, Tomasz; Sowinski, Tomasz; Pietraszewicz, Joanna; Gajda, Mariusz [Instytut Fizyki PAN, Al. Lotnikow 32/46, PL-02-668 Warszawa (Poland); Brewczyk, Miroslaw [Wydzial Fizyki, Uniwersytet w Bialymstoku, ul. Lipowa 41, PL-15-424 Bialystok (Poland); Lewenstein, Maciej [ICFO, Institut de Ciences Fotoniques, Parc Mediterrani de la Tecnologia, E-08860 Castelldefels, Barcelona (Spain); ICREA, Institucio Catalana de Recerca i Estudis Avancats, E-08010 Barcelona (Spain); Zakrzewski, Jakub [Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ul. Reymonta 4, PL-30-059 Krakow (Poland); Mark Kac Complex Systems Research Center, Jagiellonian University, ul. Reymonta 4, PL-30-059 Krakow (Poland)

2011-06-15T23:59:59.000Z

493

The reaction of benzene with a ground state carbon atom, C,,3 Holger F. Bettingera)  

E-Print Network (OSTI)

­hydrogen exchange channel, i.e., a carbon atom is incorporated into the molecule and a hydro- gen atom is ejected. With ethylene, the incoming triplet car- bon atom is known to attack the electrons to form triplet

Kaiser, Ralf I.

494

Atomic-Scale Chemical Imaging via Combination of Scanning Tunneling and Electron Energy Loss Spectroscopies  

E-Print Network (OSTI)

Atomic-Scale Chemical Imaging via Combination of Scanning Tunneling and Electron Energy Loss visualization of chemical reaction pathways to provide mechanistic understanding for catalytically important systems at atomic level Develop atomically resolved chemical imaging platform via combination of low

495

A Vital Legacy - Biological and Environmental Research in the Atomic Age  

E-Print Network (OSTI)

Environmental Research in the Atomic Age S e p t e m b e rEnvironmental Research in the Atomic Age September T o thesense that ours would be the Atomic Age. By the time of the

Vaughan editor, Douglas

2010-01-01T23:59:59.000Z

496

Light pulse atom interferometry at short interrogation times for inertial navigation  

E-Print Network (OSTI)

Light pulse atom interferometry with cold atoms is a promising inertial sensing technology for high accuracy navigation. At present, laboratory atom interferometers match or surpass state of the art mechanical and optical ...

Butts, David LaGrange

2012-01-01T23:59:59.000Z

497

Compilation and evaluation of atomic and molecular data relevant to controlled thermonuclear research needs: USA programs  

SciTech Connect

The U.S. role in the compilation and evaluation of atomic data for controlled thermonuclear research is discussed in the following three areas: (1) atomic structure data, (2) atomic collision data, and (3) surface data. (MOW)

Barnett, C.F.

1976-01-01T23:59:59.000Z

498

Secretary Chu Addresses the International Atomic Energy Agency General  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Secretary Chu Addresses the International Atomic Energy Agency Secretary Chu Addresses the International Atomic Energy Agency General Conference Secretary Chu Addresses the International Atomic Energy Agency General Conference September 20, 2010 - 12:00am Addthis Washington, DC - U.S. Energy Secretary Steven Chu addressed the International Atomic Energy Agency's 54th General Conference today in Vienna. His prepared remarks are below: Thank you, Ambassador Enkhsaikhan. Congratulations on your election as President of this Conference. I extend my thanks and appreciation to Director General Mr. Yukiya Amano for his exemplary leadership in his first year. I especially welcome the Director General's initiative to help fight cancer in developing countries. I am honored to represent the United States today, and I want to share a

499

EA-1053: Decontaminating and Decommissioning the General Atomics Hot Cell  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3: Decontaminating and Decommissioning the General Atomics 3: Decontaminating and Decommissioning the General Atomics Hot Cell Facility, San Diego, California EA-1053: Decontaminating and Decommissioning the General Atomics Hot Cell Facility, San Diego, California SUMMARY This EA evaluates the environmental impacts of the proposal for low-level radioactive and mixed wastes generated by decontaminating and decommissioning activities at the U.S. Department of Energy's General Atomics' Hot Cell Facility would be transported to either a DOE owned facility, such as the Hanford site in Washington, or to a commercial facility, such as Envirocare in Utah, for treatment and/or storage and disposal. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD August 14, 1995 EA-1053: Finding of No Significant Impact

500

Secretary Chu Addresses the International Atomic Energy Agency General  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Addresses the International Atomic Energy Agency Addresses the International Atomic Energy Agency General Conference Secretary Chu Addresses the International Atomic Energy Agency General Conference September 20, 2010 - 12:00am Addthis Washington, DC - U.S. Energy Secretary Steven Chu addressed the International Atomic Energy Agency's 54th General Conference today in Vienna. His prepared remarks are below: Thank you, Ambassador Enkhsaikhan. Congratulations on your election as President of this Conference. I extend my thanks and appreciation to Director General Mr. Yukiya Amano for his exemplary leadership in his first year. I especially welcome the Director General's initiative to help fight cancer in developing countries. I am honored to represent the United States today, and I want to share a message from President Barack Obama: