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Phys Rev Lett. 2002 Nov 25;89(22):223002. Epub 2002 Nov 12.

Correlation between double and nonresonant single ionization.

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Department of Molecular and Optical Physics, Albert-Ludwigs-Universit├Ąt Freiburg, Hermann-Herder-Strasse 3, Germany.


We performed simultaneous measurements of electrons and ions produced in Xe photoionization driven by an 800-nm, 100-fs laser pulse. The obtained energy and angular resolved electron spectra allow the identification of the electronic states populated during the ionization. Xe2+ ions appear at the same laser intensity as electrons emerging from a nonresonant 9-photon ionization process of Xe. Similar to optical tunneling ionization, the nonresonant ionization delivers low-energy electrons needed for the formation of Xe2+ by a backscattering process.

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