Rescattering effects in laser-assisted electron-atom bremsstrahlung

Authors

A. N. Zheltukhin, Voronezh State University, RussiaFollow
A. V. Flegel, Voronezh State University, Voronezh, Russia
M. V. Frolov, Voronezh State University, RussiaFollow
N. L. Manakov, Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 RussiaFollow
Anthony F. Starace, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

3-16-2015

Citation

Published in Journal of Physics B: Atomic, Molecular and Optical Physics 48 (2015) 075202; doi:10.1088/0953-4075/48/7/075202 (15pp).

Since IOP does not permit deposit of their PDF version, archived here is the version, dated Feb. 5, 2015 (v.2) from arXiv.org at http://arxiv.org/abs/1501.01263v2

Comments

Copyright © 2015 IOP Publishing Ltd.

Abstract

Rescattering effects in non-resonant spontaneous laser-assisted electron–atom bremsstrahlung (LABrS) are analyzed within the framework of time-dependent effective-range (TDER) theory. It is shown that high energy LABrS spectra exhibit rescattering plateau structures that are similar to those that are well-known in strong field laser-induced processes as well as those that have been predicted theoretically in laser-assisted collision processes. In the limit of a low-frequency laser field, an analytic description of LABrS is obtained from a rigorous quantum analysis of the exact TDER results for the LABrS amplitude. This amplitude is represented as a sum of factorized terms involving three factors, each having a clear physical meaning. The first two factors are the exact field-free amplitudes for electron–atom bremsstrahlung and for electron– atom scattering, and the third factor describes free electron motion in the laser field along a closed trajectory between the first (scattering) and second (rescattering) collision events. Finally, an extension of these TDER results to the case of LABrS in a Coulomb field is discussed.