Resonant inelastic x-ray scattering and photoemission measurement of O2 : Direct evidence for dependence of Rydberg-valence mixing on vibrational states in O 1 s → Rydberg states
High-resolution resonant inelastic x-ray scattering (RIXS) and low-energy photoemission spectra of oxygen molecules have been measured for investigating the electronic structure of Rydberg states in the O 1s → σ∗ energy region. The electronic characteristics of each Rydberg state have been successfully observed, and new assignments are made for several states. The RIXS spectra clearly show that vi