Free-free transitions in a bichromatic field of frequencies ω and 2ω at moderate field intensities

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Free-free transitions in laser-assisted electron-hydrogen scattering in a bichromatic field of frequencies ω and 2ω are studied at moderate intensities for fast projectiles. A hybrid approach is used, in which the field-projectile interaction is described exactly but the field-target one is described by second order perturbation theory; the projectile-target interaction is treated in the first Born approximation. The adopted description of the target enables a consistent study of the leading process to each of the considered sidebands. Numerical results are presented for the angular distributions in a geometry and at frequencies for which the target dressing is important. The influence of the relative phase between the fields is investigated, too.