Laser-assisted singly and doubly ionizing electron-helium collisions at high impact energy and large momentum transfer

Abstract

SynopsisElectron-impact single and double ionization of a helium atom in the presence of laser radiation with low frequency and intensity is studied theoretically. The kinematical regime of high impact energy and large momentum transfer, with two fast electrons in the final channel, is considered. Fully differential cross sections corresponding to the laser-assisted (e, 2e) and (e, 3e) processes are calculated for different models of the target state. The laser-assisted cross sections are found to be more sensitive to the electron-electron correlations in helium than the field-free ones.