Abstract
Numerical simulation of multiphoton ionization of a one-dimensional model atom reveals new features in superintense laser fields. Graphs of above-threshold ionization (ATI) electron spectra and the corresponding time-dependent ionization probability curves show drastic changes from those of lower-intensity cases. A new type of ATI peak splitting as well as ionization rate suppression occur for high-frequency excitation with intensities up to approximately 25 a.u.
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