Phys. Rev. Lett. 93, 083903 (2004) [4 pages]Observation of Two-Photon Above-Threshold Ionization of Rare Gases by xuv Harmonic PhotonsReceived 18 February 2004; published 19 August 2004 We have successfully observed two-photon above-threshold ionization in rare gas atoms (Ar, Xe, and He) by the fifth harmonic (25 eV photon energy) of a KrF laser. Use of the energy-resolved photoelectron counting system together with our laser, providing strong 25 eV radiation at 40–100 Hz, enabled us to detect the very weak single-color two-photon above-threshold ionization signals. Experimental data are in good agreement with our theoretical calculations newly developed along the line of multichannel quantum defect theory. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.083903
DOI:
10.1103/PhysRevLett.93.083903
PACS:
42.65.Ky, 32.80.Rm
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