Abstract
Multiphoton ionization of Xe and Kr is investigated with intense 0.62-\ensuremath{\mu}m pulses of 900, 90, and 22 fsec duration. Deviation from the scaling of lowest-order perturbation theory is observed. For the shortest pulses a modified Keldysh theory closely fits the experimental data for xenon. The importance of dynamic resonances and the shifting ionization potential is discussed.
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