Phys. Rev. A 75, 033411 (2007) [6 pages]Two-photon double ionization of helium in the region of photon energies 42–50 eVReceived 19 November 2006; revised 20 February 2007; published 23 March 2007 We report the total integrated cross section (TICS) of two-photon double ionization of helium in the photon energy range from 42 to 50 eV. Our computational procedure relies on a numerical solution of the time-dependent Schrödinger equation on a square-integrable basis and subsequent projection of this solution on a set of final field-free states describing correlation in the two-electron continuum. Our results suggest that the TICS grows monotonically as a function of photon energy in the region of 42–50 eV, possibly reaching a maximum in the vicinity of 50 eV. We also present fully resolved triple-differential cross sections for selected photon energies. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.033411
DOI:
10.1103/PhysRevA.75.033411
PACS:
32.80.Rm, 32.80.Fb, 42.50.Hz
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