Local Electronic Structures in Molecular Interaction Systems Studied by Soft X-Ray Core Excited Spectroscopies

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Local electronic structures of weak molecular interaction systems such as molecular clusters, liquids, and organic molecular solids were investigated by soft X-ray absorption spectroscopy and resonant Auger electron and emission spectroscopy after core excitation processes. The local structures of rare gas clusters and Kr/Xe mixed clusters were revealed by soft X-ray photoelectron spectroscopy. We developed a liquid cell for the soft X-ray absorption spectroscopy in a transmission mode, and revealed hydration structures of alkali metal cations in aqueous salt solutions. We also investigated the site-specific inter- molecular interaction in crystalline phthalocyanine films by X-ray emission spectroscopy.