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Iterative energy self-calibration of Fe XANES spectra

DOI: 10.1107/S1600577519014267 DOI Help

Authors: Michael W. M. Jones (Queensland University of Technology) , Guilherme Mallmann (Australian National University) , Jeremy L. Wykes (ANSTO Australian Synchrotron) , Joseph Knafelc (Queensland University of Technology) , Scott E. Bryan (Queensland University of Technology) , Daryl L. Howard (ANSTO Australian Synchrotron)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 27

State: Published (Approved)
Published: November 2019

Abstract: Determining the oxidation state of Fe through parameterization of X-ray absorption near-edge structure (XANES) spectral features is highly dependent on accurate and repeatable energy calibration between spectra. Small errors in energy calibration can lead to vastly different interpretations. While simultaneous measurement of a reference foil is often undertaken on X-ray spectroscopy beamlines, other beamlines measure XANES spectra without a reference foil and therefore lack a method for correcting energy drift. Here a method is proposed that combines two measures of Fe oxidation state taken from different parts of the spectrum to iteratively correct for an unknown energy offset between spectra, showing successful iterative self-calibration not only during individual beam time but also across different beamlines.

Journal Keywords: Fe XANES; energy calibration; mid-ocean ridge basalt (MORB); RGM-2; rhyolite; Havre pumice

Subject Areas: Technique Development, Physics

Instruments: I18-Microfocus Spectroscopy

Other Facilities: Australian Synchrotron