Critical behavior of electron impact ionization of atoms

Imad Ladadwa, Sabre Kais

Research output: Contribution to journalConference article

3 Citations (Scopus)


Cross sections of the electron impact ionization for different atoms are calculated numerically in the Born approximation as a function of both the incident electron energy and the nuclear charge Z of the ionized atom. We show that the cross section for ionization tends to a large magnitude as the nuclear charge of the target atom tends to its critical value, where the critical nuclear charge is the minimum charge necessary to bind N electrons. Results show that there is a fundamental difference in the change of the cross section near the critical point depending on whether the transition from bound to a continuum state is first order or continuous. The cross section for ionization and the threshold power law for two and three electrons are discussed.

Original languageEnglish
Pages (from-to)575-581
Number of pages7
JournalInternational Journal of Quantum Chemistry
Issue number4-5
Publication statusPublished - 1 Nov 2000
EventInternational Symposium on Atomic,Molecular, and Condensed Matter Theory - St. Augustine, FL, USA
Duration: 25 Feb 20003 Mar 2000


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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