Abstract
Laser-assisted electron-helium scattering is studied by perturbation theory for electron energies \ensuremath{\leqslant}2.6 eV and ${\mathrm{CO}}_{2}$ laser intensities \ensuremath{\leqslant}1\ifmmode\times\else\texttimes\fi{}${10}^{6}$ W/${\mathrm{cm}}^{2}$. A model potential is adopted that gives a good description of the field-free elastic scattering. Results are presented for one- and two-photon processes. It is found that absorption cross sections are larger than those for emission. The dependences on electron energy at zero energy for absorption and at the n\ensuremath{\omega} thresholds for emission are analyzed. The elastic scattering within the laser pulse is discussed and related to a general sum rule involving the n-photon process probabilities.
Published Version
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