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

Free-free transitions in laser-assisted electron-hydrogen scattering in a b ichromatic field of frequencies omega and 2 omega are studied at moderate i ntensities for fast projectiles. A hybrid approach is used, in which the fi eld-projectile interaction is described exactly but the field-target one is described by second order perturbation theory; the projectile-target inter action 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 d istributions in a geometry and at frequencies for which the target dressing is important. The influence of the relative phase between the fields is in vestigated, too.