Spontaneous Bremsstrahlung in Scattering of an Electron by a Nucleus in the Field of Two Light Waves

Abstract

We theoretically investigate nonresonant spontaneous bremsstrahlung in the scattering of an electron by a nucleus in the field of two linearly polarized light waves propagating in the same direction in the general relativistic case. It is demonstrated that there are two substantially different kinematic ranges: the noninterference range, where the Bunkin-Fedorov quantum parameters serve as multiphoton parameters,and the interference range, where interference effects become significant, and quantum interference parameters play the role of multiphoton parameters. We determine the cross sections of electron-nucleus spontaneous bremsstrahlung in these kinematic ranges. It is demonstrated that the partial cross section in the interference range with emission (absorption) of photons at combination frequencies may considerably exceed the corresponding cross section for any other geometry.