Phys. Rev. A 70, 043412 (2004) [4 pages]Two-photon above-threshold-ionization cross sections of rare-gas atoms by xuv photonsReceived 1 July 2004; published 21 October 2004 We have calculated the two-photon above-threshold-ionization cross sections of rare-gas atoms by extreme ultraviolet (xuv) photons in the extended framework of multichannel quantum defect theory. Since free-free dipole moments do not converge in the length gauge, we have made the combined use of the length gauge for small r and the acceleration gauge for large r. The two-photon above-threshold ionization cross sections for Xe and Ar associated with the p5[2P3∕2] and p5[2P1∕2] ionic core states are calculated to be 1.0×10−51 cm4 s and 2.0×10−51 cm4 s, respectively, for 25‐eV photons. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.043412
DOI:
10.1103/PhysRevA.70.043412
PACS:
42.50.Hz, 42.65.Ky, 32.80.Rm
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