Analysis of K‐absorption extended X‐ray absorption fine structure data of some transition metals

Abstract

A simplified method of analysis of the extended X‐ray absorption fine structure (EXAFS) data is presented. The experimental EXAFS data for cobalt, manganese, chromium, iron and zinc have been analyzed to illustrate the procedure. Theoretical EXAFS data have been generated using standard EXAFS equation employing MathCAD programming. The phase shift parameter has been computed from experimental spectra itself, the backscattering amplitude has been taken from the available theoretical tabulations and other parameters have been taken from crystallographic data. The theoretical EXAFS data agree well with the experimental data. Fourier transforms of both the experimental and theoretical data have been computed, and the two Fourier transforms agree well with each other in case of all the metals. The analysis yields bond length of the first coordination shell that agrees well with the crystallographic value in the metals under consideration. Copyright © 2012 John Wiley & Sons, Ltd.

X-ray fluorescence determination of the manganese valence state and speciation in manganese ores

“…X-ray photoelectron spectroscopy, [5][6][7] X-ray absorption near edge structure, and extended X-Ray absorption fine structure. [8][9][10][11][12][13][14][15] The X-ray photoelectron spectroscopy method provides information only on the substance surface, whereas measurement of absorption spectra requires the beams of high radiation intensity. The capacity to employ the ratios of X-ray spectral line intensities for the electron probe microanalysis determination of the elemental valence state has been reviewed.…”

“…To determine manganese valence state in minerals, the following X‐ray methods are applied: e.g. X‐ray photoelectron spectroscopy, X‐ray absorption near edge structure, and extended X‐Ray absorption fine structure . The X‐ray photoelectron spectroscopy method provides information only on the substance surface, whereas measurement of absorption spectra requires the beams of high radiation intensity.…”