Coster-Kronig electrons from Nq+ (q1-3) and Oq+ (q1,2) Rydberg states produced in high-energy collisions with He

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

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Coster-Kronig (C-K) electrons ejected through autoionization decay of high-Rydberg states in high-energy collisions of Nq+ (q 1-3) and O q+ (q 1,2) with He have been measured with high resolution by using zero-degree electron spectroscopy. Autoionizing lines are observed corresponding to decays from 1s22p(2P)nl Rydberg states for 21 MeV N3+ + He, from 1s22s2p(3P)nl Rydberg states for 21 MeV N2+ + He and from 1s22s2p2( 4P)nl Rydberg states for 14 MeV N+ + He, respectively. Angular momentum distributions of these three series of C-K decaying Rydberg states for Nq+ (q 1-3) projectiles are also discussed, where the highly excited states are formed by single-electron excitation. Similarly, series of the autoionizing Rydberg states are observed for two charge states of incident O ions. The C-K spectra observed can be assigned to decays from 1s 22s2p2(4P)nl states for 30 MeV O2+ + He and from 1s22s2p3(5S)nl states for 15 MeV O+ + He.

Original languageEnglish
Article number012048
JournalJournal of Physics: Conference Series
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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