Lebed' O. Stimulated and spontaneous bremsstrahlung in the electron scattering by a nucleus in pulsed light field

Electron scattering by a nucleus in pulsed light field was theoretically investigated in the frame of the Born approximation. It is shown that the stimulated emission-absorption probability in the case of a pulsed light wave is determined by the average value of corresponding probabilities in the case monochromatic wave. Spontaneous bremsstrahlung owing to electron scattering by a nucleus in pulsed light field was theoretically investigated. It is shown that the cross section of the process with hard spontaneous-photon emission on several times greater than corresponding cross section in external field absence when the oscillation velocity of an electron in the pulse peak is in order of magnitude greater than or equal to the velocity of translational motion. Resonant spontaneous bremsstrahlung by an electron scattered by a nucleus was theoretically investigated. Resonant infinities are eliminated from the process cross section by the sequential method in the frame of examined approaches rather than by the phenomenological Breit-Wigner procedure. Within the range of relativistic electron energies the resonant differential cross section of electron-nucleus spontaneous bremsstrahlung may be five orders of magnitude greater than the corresponding cross section in the absence of external field. Within the range of ultrarelativistic electron energies, this ratio decreases drastically.