Electron-impact multiple ionization of Baq+ ions ( 1 ≤ q ≤ 13 ) via resonant 3d excitation

H. Knopp, C. Böhme, J. Jacobi, S. Ricz, S. Schippers, A. Müller

Research output: Contribution to journalConference article

4 Citations (Scopus)


One ionization mechanism of barium ions is the resonant excitation of a 3d inner-shell electron with the subsequent decay of the resulting highly excited intermediate state by multiple autoionization processes. We have experimentally studied this process by observing associated resonance structures - in the energy range 700-800 eV - in the multiple (up to sevenfold) ionization cross-sections of Baq+ ions with 1 ≤ q ≤ 13. The 3d-resonance strength is determined quantitatively as a function of initial and final ion charge state. The results suggest a statistical description of multiple ionization via the excitation of inner-shell electrons.

Original languageEnglish
Pages (from-to)433-436
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Publication statusPublished - May 1 2003
EventHCI - 2001 - Caen, France
Duration: Sep 1 2002Sep 6 2002



  • Crossed beams
  • Electron-impact ionization
  • Inner-shell excitation
  • Multiple ionization

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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