Low-energy electron capture by C4+ ions from atomic hydrogen

FW Bliek*, R Hoekstra, ME Bannister, CC Havener

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

33 Citations (Scopus)

Abstract

The total-electron-capture cross section for collisions of C4+ with ground-state hydrogen (deuterium) is measured in the energy range 6-1000 eV/u using the merged-beam technique. The fraction of C4+ metastable ions present in the ion beam is measured to be 5%, which results in a correction to the cross section of only a few percent. The independently absolute measurements are generally in good agreement with previous measurements for total electron capture; however, the reduced uncertainties of these measurements allow a more detailed comparison with theory. Our observations show that existing fully quantal molecular-orbital calculations that include rotational coupling overestimate the cross section by approximately 25%. Better agreement is found with a recent semiclassical impact-parameter coupled-channel calculation. While all available theoretical data predict that the cross section varies smoothly with energy around the maximum, a sharp structure is observed around 400 eV/u.

Original languageEnglish
Pages (from-to)426-431
Number of pages6
JournalPhysical Review A
Volume56
Issue number1
Publication statusPublished - Jul-1997

Keywords

  • MULTIPLY-CHARGED ION
  • SLOW COLLISIONS
  • CROSS-SECTIONS
  • MERGED-BEAMS
  • H-ATOMS
  • H-2
  • C-4+

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