Electron-atomic-hydrogen elastic exchange collisions in the presence of a laser field
- 14 April 1986
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 19 (7) , 1081-1092
- https://doi.org/10.1088/0022-3700/19/7/017
Abstract
A theoretical study is made of elastic exchange collisions of fast electrons with atomic hydrogen in the presence of a laser. The ratios between exchange and direct differential cross sections in the field-assisted and the field-free cases are compared, using (i) laser-dressed atomic wavefunctions, accounting for the dipole moment induced by the field on the hydrogen ground state; (ii) the eikonal-Born series approximation for the direct scattering amplitude; (iii) a second-order treatment in the electron-electron interaction for the exchange amplitude. The authors find that the laser greatly modifies the process, introducing a strong asymmetry between the absorption and emission of photons.Keywords
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