Two-Electron Systems—The Helium Atom

  • Arno Bohm
Part of the Texts and Monographs in Physics book series (TMP)


The system with two electrons is studied in this chapter. Section XI.1 shows that the space of physical states of the helium atom is the sum of the parahelium and the orthohelium spaces. In Section XI.2 the ionization thresholds (i.e., the energy values En∞ at which one electron is in the nth level and the other is just dissociating from the atom) are determined, and the energy levels below the first ionization threshold are discussed. Section XI.4 discusses the energy levels above the first ionization threshold without considering the interaction between these levels and the energy continuum of the (He +, e) system.


Triplet State Orbital Angular Momentum Energy Operator Total Angular Momentum Helium Atom 
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  1. 4.
    For more details, see Bethe and Salpeter (1957), in particular Chapter IIb.Google Scholar
  2. 5.
    Extensive theoretical calculations of these energy levels by various approximation methods have been performed and agree with the observed values; see J. Macek, J. Phys. B 1, 831 (1968) and references therein.ADSGoogle Scholar
  3. 5a.
    See also U. Fano : Doubly Excited States of Atoms in Atomic Physics, edited by V. W. Hughes et al., Plenum, New York (1969).Google Scholar
  4. 6.
    J. W. Cooper, U. Fano, and F. Prats, Phys. Rev. Lett. 10, 518 (1965).ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1986

Authors and Affiliations

  • Arno Bohm
    • 1
  1. 1.Department of Physics Center for Particle TheoryThe University of Texas at AustinAustinUSA

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