Short-range structure determination by EXAFS spectroscopy: Theory, experimental technique and spectral analysis
✍ Scribed by G. Vlaic; J. C. J. Bart
- Book ID
- 104588422
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 560 KB
- Volume
- 101
- Category
- Article
- ISSN
- 0165-0513
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✦ Synopsis
Abstract
A physico‐chemical description of the extended X‐ray absorption fine structure (EXAFS) phenomenon is given and experimental methods for its measurement in transmission mode are indicated. Pros and cons of various procedures for careful evaluation of the experimental absorption data are described, which comprise background removal according to Victoreen's relation or by polynomial fitting and criteria for Fourier filtering methods are given. Three different approaches for EXAFS signal analysis are discussed namely fitting with parametrized amplitude and phase functions, comparison of experimental data with theoretical EXAFS spectra and Fourier transform techniques; the limits of applicability of these procedures are indicated. A critical evaluation is given for the various methods for correction of the resulting radial distribution function in order to comply with crystallographic distances. The determination of coordination numbers is discussed and the procedures are illustrated with results for metallic titanium, rutile and anatase.