Semi-Empirical and Semi-Classical Approximations for Electron Ionization

  • S. M. Younger
  • T. D. Märk


Until quite recently very little information was available concerning electron impact ionization. Other chapters in this book amply demonstrate the formidable experimental complexities associated with the accurate measurement of electron impact ionization cross sections as well as the still unresolved theoretical picture. In order to fill the void between data required and data available, a large number of attempts have been made to extend our current quantitative knowledge of the electron impact ionization process by means of semi-empirical and semi-classical prescriptions. The general goal of all these methods is to use one or another basic approximation to generate ionization cross section data for a broad class of atoms, molecules and ions in some selected energy region. Each method is designed to fit a specific need, with some methods more generally applicable than others which might be more tightly controlled by empirical evidence.


Electron Ionization Electron Impact Ionization Ionization Cross Section Partial Cross Section Double Ionization 
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Copyright information

© Springer-Verlag Wien 1985

Authors and Affiliations

  • S. M. Younger
    • 1
  • T. D. Märk
    • 2
  1. 1.Lawrence Livermore National LaboratoryLivermoreUSA
  2. 2.Institut für ExperimentalphysikLeopold-Franzens-UniversitätInnsbruckAustria

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