Secondary threshold laws for multiple ionization of atoms

G. F. Gribakin, Sudhakar Sahoo, V.N. Ostrovsky

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We propose a physical mechanism that leads to the emergence of secondary threshold laws in processes of multiple ionization of atoms. We argue that the removal of n electrons (n>2) from a many-electron atom may proceed via intermediate resonant states of the corresponding doubly charged ion. For atoms such as rare gases, the density of such resonances in the vicinity of subsequent ionization thresholds is high. As a result, the appearance energies for multiply charged ions are close to these thresholds, while the effective power indices mu in the near-threshold energy dependence of the cross section, sigmaproportional toE(mu), are lower compared to those from the Wannier theory. This provides a possible explanation of the recent experimental results of B. Gstir [Nucl. Instrum. Methods Phys. Res. B 205, 413 (2003)].
Original languageEnglish
Article number062717
Pages (from-to)062717-1-062717-6
Number of pages6
JournalPhysical Review A
Volume70
Issue number6
DOIs
Publication statusPublished - Dec 2004

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

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