Abstract
We present the theoretical calculation of the differential scattering cross section for elastic electron-helium scattering in the presence of a bichromatic CO2 laser field. The two components of the laser field have the frequencies and 2, which are out of phase by an arbitrary scale . The calculation is done in the first Born approximation taking into account both the direct and the exchange scattering amplitudes and using the closure approximation. The dressing of the target states is found to be considerable in the region of small scattering angles. There are important modifications of the scattering cross section as a function of the phase angle . The calculated spectra of the scattered electrons (for l>0 and l<0) are in mirror symmetry for = 0 versus = and symmetric for = /2 with respect to l = 0. The second harmonic does not contribute to the scattering in the small angle region, but modifies it strongly for higher scattering angles. Finally, we make a comparison between our semiclassical approach and the quantal approach of Rabadan et al (1996 J. Phys. B: At. Mol. Opt. Phys. 29 163-175).
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