Chemical State Mapping by X-Ray Fluorescence Using Absorption Edge Shifts

Abstract
Spatial distributions of chemical states of an element were determined by the measurement of X-ray fluorescence emission based on the selective excitation. Due to the chemical shifts of absorption edges, energy dependence of the fluorescent X-rays intensity near the edge is characteristic for the chemical state. There is a certain appropriate energy which selectively excites the specific valence state. Experimental results of the chemical state mapping of Fe-O and Cr-O systems are shown. The image reconstruction technique with the line shaped incident X-rays as well as the ordinary point-by-point scanning was employed.

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