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Phys. Rev. A 70, 043412 (2004) [4 pages]

Two-photon above-threshold-ionization cross sections of rare-gas atoms by xuv photons

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Takashi Nakajima1,2 * and Shuntaro Watanabe2
1Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
2Institute for Solid State Physics (ISSP), The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

Received 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

* Email address: t-nakajima@iae.kyoto-u.ac.jp

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