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Dynamics of the above-threshold ionization of atoms in an intense field

Based on the method of solving the Schrodinger equation in momentum space, which facilitates the extraction of the rapidly varying part of the wavefunction, it can be shown that the Keldysh-Faisal-Reiss approximation is only a limiting situation of the general approach for the strong-field ionization. The author has also studied the suppression of the low-energy peaks in the above-threshold ionization and some interesting points are discussed.