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Ionization of Atomic Ions by Electron Impact

  • P. Defrance
  • M. Duponchelle
  • D. L. Moores

Abstract

Electron impact ionization of a positive ion may occur directly, when one or more electrons are ejected from an outer or inner shell by direct impact with the incident electron, or indirectly, via an intermediate autoionizing state of the target system. The most important indirect ionization process is excitation-autoionization (EA), in which the incident electron excites the target ion usually, but not always, from an inner shell into a short-lived state with energy in excess of that required to ionize the system, which subsequently decays by autoionization (an Auger transition). Alternatively, the incident electron may be captured by the target ion into a short lived state of a compound ion which then decays by two successive autoionizing transitions. This sequence of processes is called resonant-recombination-double autoionization (REDA) although the words “capture” or “recombination” may be more appropriate than “excitation” in this context. If the compound state decays directly by simultaneous ejection of two electrons, the process is called resonant-excitation-auto-double ionization (READI). These three processes all lead to single ionization of the original target ion.

Keywords

Ionization Cross Section Direct Ionization Excitation Cross Section Double Ionization Autoionizing State 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • P. Defrance
    • 1
  • M. Duponchelle
    • 1
  • D. L. Moores
    • 2
  1. 1.Department of PhysicsUniversité Catholique de LouvainLouvain-la-NeuveBelgium
  2. 2.Department of Physics and AstronomyUniversity College LondonLondonUK

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