Local order at the manganese sites in ionic solutions by XANES (X-ray absorption near edge structure)

The idea that important geometrical informations about local structure are contained in XANES spectra has stimulated theoretical and experimental studies in this field. The low energy part of the X-ray absorption spectra, in fact, is sensitive to the geometrical arrangement of the environment around the absorbing atom because of the strong scattering power of these low energy photoelectrons, favoring multiple scattering (MS) processes. The authors report on the expressions for the first three contributions of scattering orders to the total cross section valid for the K-shell. (Auth.)