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Title: Coherent Atom Optics with fast metastable rare gas atoms

Abstract

Coherent atom optics experiments making use of an ultra-narrow beam of fast metastable atoms generated by metastability exchange are reported. The transverse coherence of the beam (coherence radius of 1.7 {mu}m for He*, 1.2 {mu}m for Ne*, 0.87 {mu}m for Ar*) is demonstrated via the atomic diffraction by a non-magnetic 2{mu}m-period reflection grating. The combination of the non-scalar van der Waals (vdW) interaction with the Zeeman interaction generated by a static magnetic field gives rise to ''vdW-Zeeman'' transitions among Zeeman sub-levels. Exo-energetic transitions of this type are observed with Ne*(3P2) atoms traversing a copper micro-slit grating. They can be used as a tunable beam splitter in an inelastic Fresnel bi-prism atom interferometer.

Authors:
; ; ; ; ;  [1];  [2]
  1. Laboratoire de Physique des Lasers, Universite Paris 13, Avenue J.B. Clement, 93430-Villetaneuse (France)
  2. Institute of Physics, Pregrevica 118, 11080 - Belgrade-Zemun (Serbia and Montenegro)
Publication Date:
OSTI Identifier:
20898643
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 876; Journal Issue: 1; Conference: 23. summer school and international symposium on the physics of ionized gases, National Park Kopaonik (Serbia), 28 Aug - 1 Sep 2006; Other Information: DOI: 10.1063/1.2406011; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC BEAMS; BEAM OPTICS; BEAM SPLITTING; COPPER; DIFFRACTION; DIFFRACTION GRATINGS; FRESNEL LENS; INTERFEROMETERS; MAGNETIC FIELDS; METASTABLE STATES; PRISMS; REFLECTION; VAN DER WAALS FORCES; ZEEMAN EFFECT

Citation Formats

Grucker, J., Baudon, J., Karam, J.-C., Perales, F., Vassilev, G., Ducloy, M., and Bocvarski, V. Coherent Atom Optics with fast metastable rare gas atoms. United States: N. p., 2006. Web. doi:10.1063/1.2406011.
Grucker, J., Baudon, J., Karam, J.-C., Perales, F., Vassilev, G., Ducloy, M., & Bocvarski, V. Coherent Atom Optics with fast metastable rare gas atoms. United States. doi:10.1063/1.2406011.
Grucker, J., Baudon, J., Karam, J.-C., Perales, F., Vassilev, G., Ducloy, M., and Bocvarski, V. 2006. "Coherent Atom Optics with fast metastable rare gas atoms". United States. doi:10.1063/1.2406011.
@article{osti_20898643,
title = {Coherent Atom Optics with fast metastable rare gas atoms},
author = {Grucker, J. and Baudon, J. and Karam, J.-C. and Perales, F. and Vassilev, G. and Ducloy, M. and Bocvarski, V.},
abstractNote = {Coherent atom optics experiments making use of an ultra-narrow beam of fast metastable atoms generated by metastability exchange are reported. The transverse coherence of the beam (coherence radius of 1.7 {mu}m for He*, 1.2 {mu}m for Ne*, 0.87 {mu}m for Ar*) is demonstrated via the atomic diffraction by a non-magnetic 2{mu}m-period reflection grating. The combination of the non-scalar van der Waals (vdW) interaction with the Zeeman interaction generated by a static magnetic field gives rise to ''vdW-Zeeman'' transitions among Zeeman sub-levels. Exo-energetic transitions of this type are observed with Ne*(3P2) atoms traversing a copper micro-slit grating. They can be used as a tunable beam splitter in an inelastic Fresnel bi-prism atom interferometer.},
doi = {10.1063/1.2406011},
journal = {AIP Conference Proceedings},
number = 1,
volume = 876,
place = {United States},
year = 2006,
month =
}
  • 1D and 2D reflection gratings (Permalloy stripes or dots deposited on silicon), immersed in an external homogeneous static magnetic field, are used to study 1D and 2D diffraction of fast metastable helium atoms He* (23S1). Both the grazing incidence used here and the repulsive potential (for sub-level m = -1) generated by the magnetisation reduce the quenching effect. This periodically structured potential is responsible for the diffraction in the incidence plane as well as for the diffraction in the perpendicular plane.
  • Integral ionization cross sections have been measured for collisions of the metastable rate gas atoms He(2 /sup 3/S), Ne(2p/sup 5/3s), and Ar(3p/sup 5/4s) with the molecular targets O/sub 2/ and Cl/sub 2/ in the energy range 30 to 1000 eV by collecting the slow mass-analyzed target ions X/sup +/,X/sup +//sub 2/ and X/sup -/,X/sup -//sub 2/, where X stands for O and Cl. The cross sections for ion pair formation yielding X/sup -/ and X/sup -//sub 2/ ions are found to be strongly influenced by the presence of continuum and energy transfer channels. The energy dependence of the cross sectionsmore » for Penning ionization leading to the formation of X/sup +/ and X/sup +//sub 2/ ions is, on the other hand, strongly altered by the presence of low-lying ionic states of the type Rg/sup +/--X/sup -//sub 2/, where Rg stands for a rare gas atom. The energy dependence of the efficiency for secondary electron emission by the metastable rare gas atom He*(2 /sup 3/S), Ne*(2p/sup 5/3s), Ar*(3p/sup 5/4s), and Kr*(4p/sup 5/5s) is presented for kinetic energies between 80 and 1000 eV.« less
  • Cross sections for the collisional ionization of the metastable atoms Ne*, Ar*, Kr*, and Xe* by electrons with impact energy E in the range 6 < E < 250 eV are determined in the Born and binary-encounter approximations. For low energies epsilon of ejection, the s-d and s-f bound-free transitions dominate the associated form factor, while transitions to continuum states with progressively higher angular momentum gain importance with increasing epsilon. While up to nine partial waves are normally sufficient for convergence of the bound-free form factor at a given energy epsilon and momentum change K of the ejected electron, asmore » many as 30 are required for those K in the vicinity of the Bethe ridge at large epsilon. These properties are the origin of the overall closeness obtained between the Born and binary-encounter cross sections. Also inner-shell ionization, as described by the binary-encounter treatment, becomes increasingly important as the target atom becomes more complex. Cross sections for ionization of metastable N/sub 2/* and CO* are also determined. Good agreement with available measurements (for Ne* and Ar*) is obtained. (AIP)« less
  • Based on a semiempirical analysis of the excimer terms and using the experimental potentials of the interaction between resonantly excited Hg(6{sup 3}P{sub 0.2}) atoms and rare gas atoms are calculated. 41 refs., 5 figs., 6 tabs.