Two-step mechanisms in ionization-excitation of He studied by binary (e,2e) experiments and second-Born-approximation calculations

Noboru Watanabe, Masahiko Takahashi, Y. Udagawa, K. A. Kouzakov, Yu V. Popov

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

An electron momentum spectroscopy study on ionization-excitation processes of He is reported. The symmetric noncoplanar (e,2e) cross sections for transitions to excited ion states have been measured relative to that to the ground ion state at impact energies of 1240 and 4260 eV. The experimental results exhibit a marked dependence on the impact energy. This provides strong evidence that higher-order effects are involved. Second-Born-approximation calculations are performed and their results are compared with the experimental ones. It is shown that the two-step mechanisms play crucial roles in the ionization-excitation processes.

Original languageEnglish
Article number052701
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume75
Issue number5
DOIs
Publication statusPublished - 2007 May 2

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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