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

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 fo...

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Bibliographic Details
Published in:Physical review letters 2003-01, Vol.90 (1), p.013003-013003, Article 013003
Main Authors: Wassaf, Joseph, Véniard, Valérie, Taïeb, Richard, Maquet, Alfred
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.90.013003