Phys. Rev. A 77, 022713 (2008) [6 pages]Ratio of double-to-single photoionization cross sections of plasma-embedded helium atoms at x-ray energiesReceived 5 January 2008; revised 21 January 2008; published 28 February 2008 The asymptotic ratios of double-to-single photoionization cross sections of plasma-embedded helium atoms at very high but nonrelativistic photon energies are calculated for different shielding parameters that are based on the Debye model for weakly coupled plasmas. The ratio of double-to-single photoionization for free atom is determined as 1.644%, in good agreement with the synchrotron measurements. The asymptotic ratio of double-to-single photoionization cross sections for different screening parameters are reported. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.022713
DOI:
10.1103/PhysRevA.77.022713
PACS:
32.80.Fb
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