Asymptotic Double-Photoexcitation Cross Sections of the Helium Atom

T. Åberg
Phys. Rev. A 2, 1726 – Published 1 November 1970
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Abstract

A relative cross section for simultaneous excitation and ionization of the helium atom is derived from the sudden approximation. It is shown to agree with that obtained from the velocity form of the cross section in the Coulomb approximation. It is connected to the asymptotic cross section of Kabir and Salpeter through the cusp condition at the nucleus. An analysis of the influence of ground-state correlations on the asymptotic double-excitation cross section is carried out.

  • Received 11 May 1970

DOI:https://doi.org/10.1103/PhysRevA.2.1726

©1970 American Physical Society

Authors & Affiliations

T. Åberg*

  • Department of Quantum Chemistry, Uppsala University, Uppsala, Sweden

  • *Nordita Fellow, on leave from Laboratory of Physics, Helsinki University of Technology, Otaniemi, Finland.

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Vol. 2, Iss. 5 — November 1970

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