X-ray absorption near-edge structure. X-ray absorption spectroscopy was carried out at the BL-12C and BL9A, High Energy Accelerator Research Organization (KEK) (the edge position was calibrated using that of Pt foil). The analysis was performed using the Demeter software platform. The simulated spectra are calculated with 6 Å radius by FDMNES package under Quadrupole, Relativiste, Spinorbite, Density_all options. 18