Determination of the absolute two-photon ionization cross section of He by an XUV free electron laser

Takahiro Sato, Atsushi Iwasaki, Kazuki Ishibashi, Tomoya Okino, Kaoru Yamanouchi, Junichi Adachi, Akira Yagishita, Hiroki Yazawa, Fumihiko Kannari, Makoto Aoyma, Koichi Yamakawa, Katsumi Midorikawa, Hidetoshi Nakano, Makina Yabashi, Mitsuru Nagasono, Atsushi Higashiya, Tetsuya Ishikawa

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

The resonant and non-resonant two-photon single ionization processes of He were investigated using intense free electron laser light in the extreme ultraviolet (XUV) region (53.4-61.4 nm) covering the 1s-2p and 1s-3p resonant transitions of He. On the basis of the dependences of the yield of He + on the XUV light-field intensity at 53.4, 58.4, 56.0 and 61.4 nm, the absolute values of the two-photon ionization cross sections of He at the four different wavelengths and their dependence on the light-field intensity were determined for the first time.

Original languageEnglish
Article number161001
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume44
Issue number16
DOIs
Publication statusPublished - 2011 Aug 28

ASJC Scopus subject areas

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

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