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Le Journal de Physique Colloques

ELECTRON-ATOM-PHOTON INTERACTIONS IN A LASER FIELD

Benjamin B. Bederson, Bernardo Jaduszliwer, GF Shen, J.-L. Cai

Published Jan 1, 1985• 0 citations
Publisher

Abstract

We are currently studying the scattering of low and intermediate energy electrons by sodium atoms in a laser field. The experimental method is discussed, with particular attention to atomic recoil after resonant photon absorption. Total scattering cross sections by 32P sodium atoms are presented.
DOI
10.1051/jphyscol:1985123

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A new method for measuring cross sections for the scattering of electrons by laser-excited atoms is described. It is a generalization of the atomic-beam recoil technique, taking advantage of the recoil of atoms during resonant photon interactions to spatially separate excited from nonexcited atoms. A preliminary value for the total cross section for the scattering of electrons by the 32P32(mF=3)3^{2}P_{\frac{3}{2}}({m}_{F}=3)32P23​​(mF​=3) state of sodium at 4.4 eV is presented.
An electron and photon atomic-recoil technique has been used to measure absolute total cross sections for electrons scattered by 32{3}^{2}32P3/2{P}_{3/2}P3/2​ sodium atoms in the 6--25-eV energy range, with the use of a new, high-resolution crossed-beam apparatus. A single-mode tunable ring dye laser is used to selectively excite the F=3 hyperfine level. Excited-state populations are determined by using the atomic recoil in resonant photon absorption. At 6 eV there is very good agreement with a previous measurement [B. Jaduszliwer, R. Dang, P. Weiss, and B. Bederson, Phys. Rev. A 21, 808 (1980)].
This talk will review electron-atom scattering experiments using recoil techniques, wherein observation of the collision process is made on the recoil-scattered atom rather than on the electron. Using this technique it is possible to obtain absolute cross sections without normalization or knowledge of the atom density in the interaction region; atomic state selection and analysis is also more readily performed. Comparisons with theory and with other crossed beam experiments, including those using polarized electrons, will be made. Details of ongoing experiments are presented in companion papers at this conference. A discussion of how laser cooling, and velocity and spatial compression can be employed to improve dramatically spatial and energy resolution and sensitivity will be presented.
Collisions studies using optically state selected beams is discussed. Measurements of spin resolved differential cross sections for superelastic scattering of electrons from excited sodium atoms (3P) are reported. The excited states are prepared by laser optical pumping with circularly polarized light thus giving a pure atomic state before the collision. A crossed beam arrangement of sodium atoms and electrons is used with a scattered electron detector. Scattered electron intensity as a function of scattering angle, incident electron energy, and relative orientation of the incident electronic and atomic spins is measured. 8 refs., 10 figs.