We consider theoretically laser-assisted ionization of a helium atom by electron impact at large momentum transfer. Fully differential cross sections of these processes are studied as functions of the recoil-ion momentum for the cases when the residual He⁺ ion is left both in the bound (n = 1 and n = 2) and in the continuum states in the presence of a linearly-polarized laser field with frequency w = 1.55 eV and intensity I = 5×10¹¹W/cm². We inspect how the orientation of the polarization influences the laser-assisted momentum profiles using different models of the helium wave function. It is found that the Kroll-Watson sum rule is well applicable in the (e, 3 − 1e) case.

Date Published: 19 March 2015
PDF: 10 pages
Proc. SPIE 9448, Saratov Fall Meeting 2014: Optical Technologies in Biophysics and Medicine XVI; Laser Physics and Photonics XVI; and Computational Biophysics, 944829 (19 March 2015); doi: 10.1117/12.2179952

Published in SPIE Proceedings Vol. 9448:
Saratov Fall Meeting 2014: Optical Technologies in Biophysics and Medicine XVI; Laser Physics and Photonics XVI; and Computational Biophysics
Elina A. Genina; Vladimir L. Derbov; Kirill V. Larin; Dmitry E. Postnov; Valery V. Tuchin, Editor(s)