Perturbative analysis of the triply differential cross section and circular dichroism in photo-double-ionization of He

Andrei Y. Istomin, N. L. Manakov, and Anthony F. Starace
Phys. Rev. A 69, 032713 – Published 24 March 2004

Abstract

We extend application of our lowest-order perturbative approach (in electron-electron correlation) for analysis of photo-double-ionization (PDI) of He [A.Y. Istomin et al., J. Phys. B 35, L543 (2002)] to excess energies up to 450eV and to analysis of circular dichroism. We find that account of electron correlation in the final state to first order provides predictions for the triply differential cross section and circular dichroism that are in reasonable agreement with absolute data for excess energies up to 80eV. For an excess energy of 450eV, account of electron correlation in both initial and final states is necessary and the predicted triply differential cross sections are in agreement with absolute data only for large mutual ejection angles. We find that at excess energies of a few tens of eV, the PDI is dominated by the “virtual” knock-out mechanism, while the “direct” (on-shell) knock-out process gives only small contributions for large mutual ejection angles. As a result, we conclude that the circular dichroism effect at these energies originates from the nonzero electron Coulomb phase shifts.

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  • Received 21 August 2003

DOI:https://doi.org/10.1103/PhysRevA.69.032713

©2004 American Physical Society

Authors & Affiliations

Andrei Y. Istomin1, N. L. Manakov2, and Anthony F. Starace1

  • 1Department of Physics and Astronomy, The University of Nebraska, Lincoln, Nebraska 68588-0111, USA
  • 2Physics Department, Voronezh State University, Voronezh 394006, Russia

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Issue

Vol. 69, Iss. 3 — March 2004

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