Abstract
The spectrum of photoelectrons emitted in the multiphoton ionization of an atom by an intense laser field is calculated with a nonperturbative theory developed several years ago. All the qualitative intensity phenomena recently observed are properly predicted. These include above-threshold ionization peaks; loss of lowest-order peaks as intensity increases; the most probable process not necessarily being the lowest order; and major qualitative differences between effects caused by linearly versus circularly polarized light. The results are dominated by the field parameters, with details of the atom having less importance. Detailed circular–linear polarization comparisons are made.
© 1987 Optical Society of America
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