Soft X-ray self-absorption structure (SX-SAS) analysis of Fe in augite crystals of scoria from Kami-Kometsuka, Aso City, Japan

Abstract

Soft X-ray Self Absorption Structure (SX-SAS) analysis is a method for analyzing chemical bonding states similar to X-ray absorption near edge structure (XANES) and electron energy loss near edge structure (ELNES) by visualizing self-absorption effects from multiple characteristic X-ray spectra measured with a soft X-ray emission spectrometer (SXES) at different electron beam accelerating voltages and analyzing structures near the absorption edge. In this study, we report the results of observing absorption edge shifts and structural changes of Fe in mineral samples as the oxidation number of Fe changes, in order to utilize SX-SAS as a useful analytical method for earth and planetary science.