Iterative energy self-calibration of Fe XANES spectra
| Autor: | Joseph Knafelc, Scott E. Bryan, Michael W. M. Jones, Guilherme Mallmann, Jeremy Wykes, Daryl L. Howard |
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| Rok vydání: | 2020 |
| Předmět: |
0303 health sciences
Nuclear and High Energy Physics Radiation Materials science Offset (computer science) 030303 biophysics 010502 geochemistry & geophysics 01 natural sciences XANES Spectral line Computational physics 03 medical and health sciences Oxidation state Energy drift Spectroscopy Instrumentation FOIL method 0105 earth and related environmental sciences |
| Zdroj: | Journal of Synchrotron Radiation. 27:207-211 |
| ISSN: | 1600-5775 |
| DOI: | 10.1107/s1600577519014267 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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