Potential scattering of electrons in the presence of an electromagnetic wave

The sufficient conditions for the generalization of the known Bunkin-Fedorov equation beyond the scope of the Born approximation are considered. These conditions are obtained directly by calculating the scattering amplitude in the second Born approximation. An eikonal approximation is developed for scattering in a wave field. The amplitude obtained satisfies the optical theorem and permits solving the problem of scattering by two centers in a bichromatic field. Scattering by a truncated Coulomb potential is specifically considered