Energy dependence of angular momentum capture states in charge exchange collisions between slow highly charged argon ions and argon neutrals

F. I. Allen, C. Biedermann, R. Radtke, G. Fussmann, and S. Fritzsche
Phys. Rev. A 78, 032705 – Published 11 September 2008

Abstract

K-shell x-ray emission measurements of electron capture into Rydberg states of Ar17+ and Ar18+ ions are carried out as a function of collision energy in order to investigate the energy dependence of angular momentum capture states in slow charge exchange collisions. The highly charged ions are produced using an electron beam ion trap and extracted onto an external argon gas target. A retardation assembly in the beamline allows projectile energies from 2keVamu down to 5eVamu to be selected. For decreasing collision energies a shift to electron capture into low orbital angular momentum capture states is observed. Comparative K-shell x-ray emission measurements of electron capture by Ar17+ and Ar18+ ions from background gas in the trap are also presented. The results of the trapping experiments are in discrepancy with those obtained using extracted ions and possible explanations are discussed.

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  • Received 29 October 2007

DOI:https://doi.org/10.1103/PhysRevA.78.032705

©2008 American Physical Society

Authors & Affiliations

F. I. Allen*, C. Biedermann, R. Radtke, and G. Fussmann

  • Lehrstuhl für Plasmaphysik, Institut für Physik der Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany and Max-Planck-Institut für Plasmaphysik, EURATOM Association, 17491 Greifswald, Germany

S. Fritzsche

  • Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany and Max-Planck-Institut für Kernphysik, 69029 Heidelberg, Germany

  • *fiallen@lbl.gov

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Vol. 78, Iss. 3 — September 2008

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