Ejected-electron spectra from Rydberg states in high-energy collisions of O3+ ions with He

K. Kawatsura, K. Takahiro, M. Sataka, M. Imai, K. Komaki, H. Sugai, H. Shibata

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


High-resolution Coster-Kronig (C-K) electron emission spectra in collisions of 32 MeV O3+ ions with a He gas target have been investigated using zero-degree electron spectroscopy. Zero-degree electron spectrum for the O 3+ projectiles exhibits a trident-like structure around the cusp peak, consisting of three clear peaks. The sharp peaks directly on either side of the cusp corresponded to autoionization lines from highly excited O 3+ ions produced in the collision with a He gas target, which are confirmed to be due to the configuration 1s22s2p(3P)5s, where the C-K ejection energy is 0.014 eV. The C-K transitions in higher energy region are found to originate in 1s22s2p(3P)nl-1s 22s2εl′ (n = 5-11). For n = 5-7, a clear angular momentum distribution is observed, where the maximum intensity is attributed to the relatively high angular momentum l = 2 or 3.

Original languageEnglish
Pages (from-to)44-46
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number1
Publication statusPublished - 2006 Apr
EventProceedings of the Sixth International Symposium on Swift Heavy Ions in Matter (SHIM 2005) -
Duration: 2005 May 282005 May 31


  • Coster-Kronig transition
  • O ion
  • Rydberg state
  • Zero-degree electron spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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