Absolute cross sections for electron-impact single ionization of Kr4+, Kr5+, and Kr7+ ions

M. E. Bannister, X. Q. Guo, and T. M. Kojima
Phys. Rev. A 49, 4676 – Published 1 June 1994
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Abstract

Absolute total cross sections for electron-impact single ionization of Kr4+, Kr5+, and Kr7+ ions have been measured using a crossed-beams technique from below threshold to 500, 400, and 500 eV, respectively, with absolute uncertainties of 12% or less. The measured cross sections are in good agreement with distorted-wave calculations and show significant contributions from excitation autoionization. Nonzero cross sections below threshold for the Kr4+ and Kr5+ ions suggest the presence of metastable ions in those two species that were extracted from an electron-cyclotron-resonance ion source. Such evidence of metastable ions was not found in the case of the Kr7+ ion measurment.

  • Received 20 December 1993

DOI:https://doi.org/10.1103/PhysRevA.49.4676

©1994 American Physical Society

Authors & Affiliations

M. E. Bannister

  • Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372

X. Q. Guo and T. M. Kojima

  • Joint Institute for Laboratory Astrophysics of the University of Colorado
  • the National Institute of Standards and Technology, Boulder, Colorado 80309-0440

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Vol. 49, Iss. 6 — June 1994

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