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The multiphoton ionization of helium has been determined for a number of laser wavelengths and intensities using the time-dependent Hartree-Fock model. Conclusions about the ionization dynamics for very-short-pulse, high-intensity lasers are discussed. The limits and characteristics of the time-dependent Hartree-Fock method for atomic physics processes are also evaluated.
K. C. Kulander (Tue,) studied this question.