Two-center electron-electron interactions in collisions of fast Ne7+ and Ne6+ ions with gas atoms

B. Sulik, S. Ricz, I. Kádár, G. Xiao, G. Schiwietz, K. Sommer, R. Köhrbrück, M. Grether, N. Stolterfoht

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2 Citations (Scopus)

Abstract

Experimental and thoeretical studies of the two-center electron-electron interaction occurring during energetic ion-atom collisions are presented. Experiments were performed using the accelerator facility VICKSI at HMI, Berlin. Electron spectra from Auger and Coster-Kronig transitions following the excitation of a highly charged neon projectile have been studied by zero-degree electron spectroscopy. Various target atoms with atomic numbers ranging from 1-18 were used as exciting partners. We applied both impact parameter treatments and the plane wave Born approximation to describe screening effects and dielectronic two-center processes ("antiscreening"). We found that the 1s-2l excitation of the Ne7+ projectile at 8.5 MeV/u impact energy is mainly due to the screened target nucleus. In contrary, two-center processes are likely to be dominant in the 2s-nl excitation of the 6 MeV/u Ne6+ projectile. The 2s-nl cross sections are roughly proportional to the number of electrons per target atom. This fact suggests that, in disagreement with first order theories, the 2s-nl excitation is significantly governed by the two center electron-electron interaction.

Original languageEnglish
Pages (from-to)262-265
Number of pages4
JournalNuclear Inst. and Methods in Physics Research, B
Volume98
Issue number1-4
DOIs
Publication statusPublished - May 3 1995

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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