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Photoelectron spectroscopy of two-photon ionisation of rare-gas atoms by multiple high order harmonics |
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| Authors: | K. Furusawa T. Okino T. Shimizu H. Hasegawa Y. Nabekawa K. Yamanouchi K. Midorikawa |
| Affiliation: | (1) Laser Technology Laboratory, RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan;(2) School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;(3) Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan |
| Abstract: | Two-photon ionisation processes of rare-gas atoms produced by a superposition of multiple high order harmonics are studied by using a photoelectron spectroscopy technique. Second-order nonlinearity is confirmed by comparing the intensity-dependent photoelectron yields between the linear and nonlinear processes, and the cross sections of these processes are estimated. We also demonstrate the autocorrelation measurement of harmonic envelopes as a preliminary step toward characterisation of an attosecond pulse train. PACS 32.80.Fb; 32.80.Wr; 42.65.-k |
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