Three-photon double ionization of an Ar atom has been investigated by photoelectron spectroscopy using an extreme ultraviolet free-electron laser. When the photon energy of the laser has been tuned to the resonances of the intermediate Ar + ion, photoelectron peaks due to the resonant two-photon single ionization of the Ar + ion have been observed. And it has been revealed that the appearance of the peaks is controlled by the mixing ratios of 3p 4 core-configurations of the multi-configuration states. Furthermore, it has been shown that the laser intensity dependence of the Ar 2+ ion production rate due to the resonant two-photon single ionization strongly deviates from that expected by perturbation theory.
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Miyauchi et al. (2011) studied this question.
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