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Phys Rev Lett. 2003 Jan 10;90(1):013003. Epub 2003 Jan 10.

Strong field atomic ionization: origin of high-energy structures in photoelectron spectra.

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1
Laboratoire de Chimie Physique-Matière et Rayonnement, Université Pierre et Marie Curie, 11, Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France.

Abstract

Two distinct interpretations have been proposed to account for conspicuous enhancements of the ionization peaks in the high energy part of above-threshold ionization spectra. One of them ascribes the enhancement to a multiphoton resonance involving an excited state, while other analysis performed for zero-range model potential link it to "channel closings, " i.e., to the change in the number of photons needed to ionize the atom when the laser intensity increases. We report the results of model calculations that confirm the existence of a resonant process in atoms and shed light on why short-range potential models can mimic the experimental observations.

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