Suppression of interference in e-e scattering by the field of a strong electromagnetic wave

Abstract
Electron-electron scattering in the presence of a strong electromagnetic field is investigated theoretically. The partial cross sections of multiphoton processes obtained are summed over the number of absorbed or emitted photons. The total cross section is shown to depend on the quantum nonlinearity parameter gamma =e nu E0/h(cross) omega 2. When gamma >>1 the electromagnetic field suppresses interference of the direct and exchange channels of e-e scattering.