Classification of Doubly Excited States of Two-Electron Atoms

  • C. D. Lin
Part of the NATO ASI Series book series (NSSB, volume 181)


Doubly excited states of atoms were first detected and discussed in the 30’s,1 but their systematic study dates from the UV photoabsorption spectroscopy of helium in the early 60’s by Madden and Codling.2–3 In the spectra, two series of resonances, one intense and the other fainter and sharper, were observed. These resonances were attributed to the temporary formation of discrete states of the doubly excited intermediate, He , which eventually autoionize into He+ (N=1)+e- . It took the great insight of Fano to recognize the important implication of the observed strong contrast in the strength of the two series. Cooper, Fano and Prats argued that these doubly excited states cannot be adequately described by the independent electron model. The designation of states such as 2snp and 2pns P° would imply that the two series have nearly identical strength. They pointed out that the experimental data indicated that the two series are better approximated as 2snp+2pns and 2snp-2pns, and labelled as the ‘+’ and the ‘-’ series, respectively.


Wave Function Excited State Quantum Number Angular Correlation Principal Quantum Number 
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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • C. D. Lin
    • 1
  1. 1.Department of Physics, Cardwell HallKansas State UniversityManhattanUSA

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