New Results for Double Excitation Processes with Helium Targets

  • Pascale J. Marchalant
  • J. Rasch
  • Colm T. Whelan
  • H. R. J. Walters
Part of the Physics of Atoms and Molecules book series (PAMO)


In this article we report on some new theoretical results on (e, 2e) excitation — ion-ization and (e,3e) of the ground state of helium. These results are a direct continuation of those presented in [1]. Our interest lies in the high energy regime and in geometries for which the incident and scattered electrons are very much faster than any ejected electron. Under these conditions, we may think of the collision as exciting a continuum state ψf of the isolated atom. In the case of excitation — ionization this state consists of the ejected electron, momentum K, moving in the field of an excited He+ ion, for example, the system He+(2s or 2p) + e-(k). In (e,3e) we have a double continuum state of the atom. In the following, we use atomic units (au) in which ħ = m e = e = 1.


Helium Atom Born Approximation Born Term Direct Continuation Spin Singlet State 
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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Pascale J. Marchalant
    • 1
  • J. Rasch
    • 2
  • Colm T. Whelan
    • 3
  • H. R. J. Walters
    • 4
  1. 1.Institut für Theoretische Physik der UniversitätFrankfurt am MainGermany
  2. 2.Laboratoire des Collisions Electronique et MoleculaireInsitute de Physique, Université de MetzMetz Cedex 3France
  3. 3.Department of Applied Mathematics and Theoretical PhysicsUniversity of CambridgeCambridgeUK
  4. 4.Department of Applied Mathematics and Theoretical PhysicsThe Queen’s University of BelfastBelfastUK

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