Highly accurate theoretical spectroscopy for inner-shell electronic processes

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We performed theoretical inner-shell spectroscopy in which new inner-shell electronic states and complex electronic states were investigated by analyzing the recent experimental observations obtained using free electron laser and multiple coincidence spectroscopy. We proposed the double core-hole spectroscopy and established the chemical concept of the relaxation and inter-atomic relaxation energies in the double core-hole states. We also developed accurate electronic structure theories for describing multi-electron processes and resonance states which are relevant for the inner-shell electronic processes. We proposed the method for analyzing the photoelectron spectroscopy of surface-molecule interacting system and elusidated the importance of electron transfer.