F-K XANES Studies of Alkaline-Earth Fluorides

Abstract

F-K X-ray absorption near edge structure (XANES) spectra of alkaline-earth fluorides have been measured with a high energy resolution using synchrotron radiation. Calculations for the observed XANES spectra have been also carried out by use of the short-range order multiple scattering theory. By comparing the observed spectra with the calculated results, we can estimate the effective anion charge distribution of -0.6, -0.65 and -0.795 for MgF 2 , CaF 2 and SrF 2 , respectively. These calculated F K-edge XANES spectra of alkaline-earth fluorides are more sensitive to the charge distribution than cation K-edge XANES.