The structure of triply excited, negative-ion resonances in the autoionizing region of helium

K. W. Trantham, M. Jacka, A. R.P. Raui, S. J. Buckman

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The formation and decay of the two lowest-lying, triply excited He- resonances in the autoionizing region of the helium spectrum (57-60 eV) have been studied by measuring electron-impact excitation functions for the n = 2 singly excited states of helium as a function of electron scattering angle. These results offer unambiguous confirmation of the classification of these states as He- 2s 2p2 2P and 2s2p2 2D, respectively. Furthermore, the observation of the relative strengths of the decay of these features into the various final states enables some speculation as to the structure of the three excited electrons.

Original languageEnglish (US)
Pages (from-to)815-824
Number of pages10
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number3
Publication statusPublished - Feb 14 1999


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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