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Title: Observation of Single Collisionally Cooled Trapped Ions in a Buffer Gas

Authors:
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Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
903310
Report Number(s):
SLAC-PUB-12500
physics/0702122; TRN: US200722%%40
DOE Contract Number:
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Submitted to Phys.Rev.Lett.
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BARIUM IONS; TRAPPING; BUFFERS; RESONANCE FLUORESCENCE; HELIUM; ARGON; DYNAMICS; COOLING; XENON; MATHEMATICAL MODELS; General Physics,PHYS

Citation Formats

Green, M., Wodin, J., DeVoe, R., Fierlinger, P., Flatt, B., Gratta, G., LePort, F., Montero Diez, M., Neilson, R., O'Sullivan, K., Pocar, A., Waldman, S., /Stanford U., Phys. Dept., Leonard, D.S., Piepke, A., /Alabama U., Hargrove, C., Sinclair, D., Strickland, V., /Carleton U., Fairbank, W., Jr., Hall, K., Mong, B., /Colorado State U., Moe, M., and /UC, Irvine /Laurentian U. /Neuchatel U. /SLAC. Observation of Single Collisionally Cooled Trapped Ions in a Buffer Gas. United States: N. p., 2007. Web. doi:10.1103/PhysRevA.76.023404.
Green, M., Wodin, J., DeVoe, R., Fierlinger, P., Flatt, B., Gratta, G., LePort, F., Montero Diez, M., Neilson, R., O'Sullivan, K., Pocar, A., Waldman, S., /Stanford U., Phys. Dept., Leonard, D.S., Piepke, A., /Alabama U., Hargrove, C., Sinclair, D., Strickland, V., /Carleton U., Fairbank, W., Jr., Hall, K., Mong, B., /Colorado State U., Moe, M., & /UC, Irvine /Laurentian U. /Neuchatel U. /SLAC. Observation of Single Collisionally Cooled Trapped Ions in a Buffer Gas. United States. doi:10.1103/PhysRevA.76.023404.
Green, M., Wodin, J., DeVoe, R., Fierlinger, P., Flatt, B., Gratta, G., LePort, F., Montero Diez, M., Neilson, R., O'Sullivan, K., Pocar, A., Waldman, S., /Stanford U., Phys. Dept., Leonard, D.S., Piepke, A., /Alabama U., Hargrove, C., Sinclair, D., Strickland, V., /Carleton U., Fairbank, W., Jr., Hall, K., Mong, B., /Colorado State U., Moe, M., and /UC, Irvine /Laurentian U. /Neuchatel U. /SLAC. Mon . "Observation of Single Collisionally Cooled Trapped Ions in a Buffer Gas". United States. doi:10.1103/PhysRevA.76.023404. https://www.osti.gov/servlets/purl/903310.
@article{osti_903310,
title = {Observation of Single Collisionally Cooled Trapped Ions in a Buffer Gas},
author = {Green, M. and Wodin, J. and DeVoe, R. and Fierlinger, P. and Flatt, B. and Gratta, G. and LePort, F. and Montero Diez, M. and Neilson, R. and O'Sullivan, K. and Pocar, A. and Waldman, S. and /Stanford U., Phys. Dept. and Leonard, D.S. and Piepke, A. and /Alabama U. and Hargrove, C. and Sinclair, D. and Strickland, V. and /Carleton U. and Fairbank, W., Jr. and Hall, K. and Mong, B. and /Colorado State U. and Moe, M. and /UC, Irvine /Laurentian U. /Neuchatel U. /SLAC},
abstractNote = {},
doi = {10.1103/PhysRevA.76.023404},
journal = {Submitted to Phys.Rev.Lett.},
number = ,
volume = ,
place = {United States},
year = {Mon May 07 00:00:00 EDT 2007},
month = {Mon May 07 00:00:00 EDT 2007}
}
  • Individual Ba ions are trapped in a gas-filled linear ion trap and observed with a high signal-to-noise ratio by resonance fluorescence. Single-ion storage times of {approx}5 min ({approx}1 min) are achieved using He (Ar) as a buffer gas at pressures in the range 8x10{sup -5}-4x10{sup -3} torr. Trap dynamics in buffer gases are experimentally studied in the simple case of single ions. In particular, the cooling effects of light gases such as He and Ar and the destabilizing properties of heavier gases such as Xe are studied. A simple model is offered to explain the observed phenomenology.
  • We report that methane, CH 4, can be used as an efficient F-state quenching gas for trapped ytterbium ions. The quenching rate coefficient is measured to be (2.8 ± 0.3) × 10 6 s -1 Torr -1. For applications that use microwave hyperfine transitions of the ground-state 171Y b ions, the CH4 induced frequency shift coefficient and the decoherence rate coefficient are measured as δν/ν = (-3.6 ± 0.1) × 10 -6 Torr -1 and 1/T2 = (1.5 ± 0.2) × 10 5 s -1 Torr -1. In our buffer-gas cooled 171Y b+ microwave clock system, we find that onlymore » ≤10 -8 Torr of CH 4 is required under normal operating conditions to efficiently clear the F-state and maintain ≥85% of trapped ions in the ground state with insignificant pressure shift and collisional decoherence of the clock resonance.« less
  • The relatively efficient in situ production of H{sup -} in an ion trap has been demonstrated. Electron impact ionization of H{sub 2} produces the trapped H{sup +} and H{sub 2}{sup +} and H{sub 2}{sup +}H{sub 2}{sup +} produces the H{sub 3}{sup +}. H{sup -} is produced by surface charge exchange of the trapped positive hydrogen ions at a cesiated HAVAR trap electrode. Proper timing of switched trapping potentials projects the positive ions to the cesiated surface and traps the H{sup -} ions. Hydrogen ions with energies of 0.5 to 6 eV are detected with high sensitivity at {nu}{sup +}= 2more » to 4 MHz by a marginal oscillator with a synthetic Q of 6000-8000. H{sup -} yields from H{sup +}, H{sub 2}{sup +} and H{sub 3}{sup +} are currently being measured.« less
  • Investigations were made of the threshold, energy, temporal, and spectral characteristics of a cryogenic pulsed electron-beam-controlled CO laser utilizing mixtures of CO with helium and nitrogen. The active volume of the experimental system was approx.5 liters, the excitation duration was 30--300 ..mu..sec, and the active gas density was < or =1.5 amagat. It was shown that cooling the active medium to 80--100 /sup o/K made it possible to increase the gain to 1.5 x 10/sup -2/ cm/sup -1/, the energy output to approx.100 Jxliter/sup -1/xamagat/sup -1/, and the efficiency to 35%. Radiation energies of approx.250 J and 400 J weremore » obtained at densities of 0.5 and 1.5 amagat, respectively. Laser action was observed in the spectral range 4.95--5.5 ..mu... On increasing the pump energy and the buffer gas concentration, the stimulated emission spectrum was shifted toward shorter wavelengths. Decreasing the CO concentration in a nitrogen mixture to 2.5% for a constant exciting pulse duration of approx.100 ..mu..sec increased the radiation pulse duration (at half-height) fromapprox.100 ..mu..sec (pure CO) to approx.3 msec. A comparison was made between the results of theoretical calculations and the experimental data given by other authors.« less
  • The measurement of the rotational state distribution of a velocity-selected, buffer-gas-cooled beam of ND{sub 3} is described. In an apparatus recently constructed to study cold ion-molecule collisions, the ND{sub 3} beam is extracted from a cryogenically cooled buffer-gas cell using a 2.15 m long electrostatic quadrupole guide with three 90° bends. (2+1) resonance enhanced multiphoton ionization spectra of molecules exiting the guide show that beams of ND{sub 3} can be produced with rotational state populations corresponding to approximately T{sub rot} = 9–18 K, achieved through manipulation of the temperature of the buffer-gas cell (operated at 6 K or 17 K),more » the identity of the buffer gas (He or Ne), or the relative densities of the buffer gas and ND{sub 3}. The translational temperature of the guided ND{sub 3} is found to be similar in a 6 K helium and 17 K neon buffer-gas cell (peak kinetic energies of 6.92(0.13) K and 5.90(0.01) K, respectively). The characterization of this cold-molecule source provides an opportunity for the first experimental investigations into the rotational dependence of reaction cross sections in low temperature collisions.« less