A feasibility investigation of speciation by Fe K-edge XANES using a laboratory X-ray absorption spectrometer

[摘要] We demonstrate effective speciation of Fe in model compounds from analysis of the weak pre-edge features in FeK-edge XANES spectra, with a commercially available laboratory X-ray spectrometer, using a spherically bent crystalanalyser and a low-power X-ray tube, in Rowland circle geometry. Direct comparison with XANES data acquired froma third generation synchrotron bending magnet beamline, using the same specimens, validated quantitative agreementin determination of the total integrated intensity and centroid position of the pre-edge feature, which are a probe ofthe electronic configuration and symmetry of the absorber atom, and hence oxidation state and co-ordination number.This work opens the door to rapid and routine speciation studies of Fe by laboratory XANES, even for materials withrelatively dilute absorber concentration of only a few mol. %.

[学科分类] 自动化工程

[关键词] XANES;X-ray Absorption Spectroscopy;iron;speciation;laboratory