Electron-atom scattering in the field of a low-frequency laser

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Abstract
Previous work on potential scattering in the field of a low-frequency laser and a model multichannel problem are combined to present a theory of electron-atom scattering in the field of a low-frequency laser. The atomic distortion by the laser is treated in perturbation theory, which is consistent with the other approximations of the theory. The only additional assumption necessary is that the scattering in the absence of the laser has no sharp resonances which participate in the scattering in the presence of the laser. A result is obtained which is a simple multichannel generalization of that of Kroll and Watson. It is used to calculate the average number of photons absorbed or emitted during scattering.