Three-photon double ionization of Ar studied by photoelectron spectroscopy using an extreme ultraviolet free-electron laser: Manifestation of resonance states of an intermediate Ar+ ion

N. Miyauchi, J. Adachi, A. Yagishita, T. Sako, F. Koike, T. Sato, A. Iwasaki, T. Okino, K. Yamanouchi, K. Midorikawa, K. Yamakawa, F. Kannari, H. Nakano, M. Nagasono, K. Tono, M. Yabashi, T. Ishikawa, T. Togashi, H. Ohashi, H. KimuraY. Senba

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19 Citations (Scopus)

Abstract

Three-photon double ionization of an Ar atom has been investigated by photoelectron spectroscopy using an extreme ultraviolet free-electron laser. When the photon energy of the laser has been tuned to the resonances of the intermediate Ar+ ion, photoelectron peaks due to the resonant two-photon single ionization of the Ar+ ion have been observed. And it has been revealed that the appearance of the peaks is controlled by the mixing ratios of 3p4 core-configurations of the multi-configuration states. Furthermore, it has been shown that the laser intensity dependence of the Ar2+ ion production rate due to the resonant two-photon single ionization strongly deviates from that expected by perturbation theory.

Original languageEnglish
Article number071001
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume44
Issue number7
DOIs
Publication statusPublished - 2011 Apr 14
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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