Observation of two-photon above-threshold ionization of rare gases by xuv harmonic photons |
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| Authors: | Miyamoto Naoki Kamei Masato Yoshitomi Dai Kanai Teruto Sekikawa Taro Nakajima Takashi Watanabe Shuntaro |
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| Institution: | Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581, Japan. |
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| Abstract: | 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. |
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