Multiphoton double ionization of Ar in intense extreme ultraviolet laser fields studied by shot-by-shot photoelectron spectroscopy |
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Authors: | Hikosaka Y Fushitani M Matsuda A Tseng C-M Hishikawa A Shigemasa E Nagasono M Tono K Togashi T Ohashi H Kimura H Senba Y Yabashi M Ishikawa T |
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Institution: | Department of Environmental Science, Niigata University, Niigata 950-2181, Japan. hikosaka@env.sc.niigata-u.ac.jp |
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Abstract: | Photoelectron spectroscopy has been performed to study the multiphoton double ionization of Ar in an intense extreme ultraviolet laser field (hν ~ 21 eV, ~ 5 TW/cm2), by using a free electron laser (FEL). Three distinct peaks identified in the observed photoelectron spectra clearly show that the double ionization proceeds sequentially via the formation of Ar(+): Ar+hν→Ar (+) + e? and Ar2(+) + 2hν→Ar(+) + e?. Shot-by-shot recording of the photoelectron spectra allows simultaneous monitoring of FEL spectrum and the multiphoton process for each FEL pulse, revealing that the two-photon ionization from Ar(+) is significantly enhanced by intermediate resonances in Ar(+). |
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