Phys. Rev. A 57, 3641–3645 (1998)Double photoionization and ionization excitation of the metastable helium S statesReceived 5 December 1997; published in the issue dated May 1998 Theoretical double photoionization cross sections are predicted for He initially in the 1s2s1S or 3S state. The probability for double photoionization is a factor of 6 higher for the 1S state at 20 eV above the threshold for double ionization and a factor of 3 larger at 80 eV above threshold. We compare these results with each other and with predictions for the high-energy limit to assess the influence of exchange on the double ejection process. Similar comparisons are also made for the process of photoionization-induced excitation of He+(n). © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.57.3641
DOI:
10.1103/PhysRevA.57.3641
PACS:
32.80.Fb, 31.50.+w
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