Two-photon double ionization of He

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110 Citations (Scopus)


We determine generalized cross sections for two-photon double ionization of He in the photon energy region between 40.7 and 47 eV where absorption of two photons can lead to non-sequential double ionization only. The present cross sections, obtained in R-matrix Floquet theory, agree with cross sections obtained from time-dependent calculations. By examining the ratio of two-photon double ionization to two-photon single ionization, we demonstrate that core excitation effects at an intensity of 10(13) W cm(-2) are relatively unimportant at 45 eV, but that they are significant at other photon energies.

Original languageEnglish
Pages (from-to)L1-L7
Number of pages7
JournalJournal of Physics B: Atomic Molecular and Optical Physics
Issue number1
Publication statusPublished - 14 Jan 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics


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