Abstract
The influence of laser polarization on the triple differential cross section (TDCS) for electron impact ionization of helium is analysed in the asymmetric coplanar geometry. The interaction of the laser field with the incident, and scattered electrons is treated non-perturbatively by using Volkov waves, while that of the ejected electron moving in the combined field of the residual ion He+ and of the laser is obtained by using the ansatz formulated by Joachain et al (1988 Phys. Rev. Lett. 61 165) for the case of atomic hydrogen. The remaining interactions are treated by using first-order perturbation theory. Detailed calculations of the scattering amplitudes are performed for a helium target. We discuss the influence of the laser polarization on TDCS as a function of the angle of ejection of the slow electron for selected choices of the laser frequency and number of photons exchanged between the external field and the electron-helium system.
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