Absolute and scaled electron-impact ionization cross-sections for hydrogen-, helium-, and lithium-like ions

H. Deutsch, K. Becker, T. D. Märk

Research output: Contribution to journalArticle

Abstract

Scaling laws and semiempirical methods can be powerful tools to predict electron-impact ionization cross-section data for modelling purposes and many other practical applications where a quick estimate of a large number of reasonably accurate cross-sections in analytical form is needed. Scaling laws can also be useful for the prediction of cross-section values for targets for which no experimental data or rigorous theoretical calculations are available. This paper describes the development of a new scaling law for electron-impact ionization cross-sections of hydrogen-, helium-, and lithium-like atomic targets based on the semiclassical Deutsch-Märk (DM) formalism. We show that the DM approach provides quantitative justification for a scaling law similar to the widely used Z4 scaling law for hydrogen-like targets (where Z is the nuclear charge) and that a new scaling law for the calculation of absolute ionization cross-sections for other isoelectronic sequences can be derived in the framework of the DM formalism. A detailed comparison of scaled and absolute cross-section estimates based on this scaling law with available experimental data is made.

Original languageEnglish (US)
Pages (from-to)207-217
Number of pages11
JournalInternational Journal of Mass Spectrometry and Ion Processes
Volume151
Issue number2-3
DOIs
StatePublished - Dec 15 1995

Keywords

  • Cross-sections
  • Electron-impact ionization
  • Ions

ASJC Scopus subject areas

  • Spectroscopy

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