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 Ar⁺+2hν→Ar²⁺+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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Hikosaka et al. (2010) studied this question.
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