Collision induced autoionisation of 2.0 – 2.4 MeV Ar+ and O+ ions

  • H. Atan
  • W. Steckelmacher
  • M. W. Lucas
Electron Capture and Loss in the Continuum
Part of the Lecture Notes in Physics book series (LNP, volume 294)


Autoionisation processes have been investigated in Ar+ + Ar and O+ + Ar collision system using the method of zero-degree spectroscopy. All the spectra were dominated by the ELC cusp, with autoionisation peaks appearing symmetrically on both sides of the wings. The energy of the autoionisation electrons were found to be as low as 8 meV with respect to the parent ion, and the analysis indicated that simultaneous electron transfer and core rearrangement, creating a 3p5(2P½) autoionisation state, is the responsible mechanism in Ar+ + Ar collision. For O+ + Ar, two possibilities : core excitation with core rearrangement creating a 2p2(1D2) autoionisation state, and double core excitation to 3pnl, could explain our data.


Channel Electron Multiplier Beam Foil Cusp Peak Electron Beam Aperture 
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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • H. Atan
    • 1
  • W. Steckelmacher
    • 1
  • M. W. Lucas
    • 1
  1. 1.School of Mathematical and Physical SciencesUniversity of SussexFalmer, BrightonEngland

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