Measurement of femtometre-scale atomic displacements by X-ray absorption spectroscopy

Robert F. Pettifer (), Olivier Mathon, Sakura Pascarelli, Michael D. Cooke and Michael R. J. Gibbs
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Robert F. Pettifer: University of Warwick
Olivier Mathon: European Synchrotron Radiation Facility (ESRF)
Sakura Pascarelli: European Synchrotron Radiation Facility (ESRF)
Michael D. Cooke: University of Sheffield
Michael R. J. Gibbs: University of Sheffield

Nature, 2005, vol. 435, issue 7038, 78-81

Abstract: EXAFS refined Extended X-ray absorption fine structure (EXAFS) is a technique widely used for structural studies by chemists, materials scientists, biologists and Earth scientists. Incremental improvements over the years mean that current EXAFS systems can determine interatomic distances with an accuracy of between 0.01 and 0.001 Å. In this issue, Pettifer et al. announce a more-than-incremental advance. Using the dispersive X-ray spectrometer at the ID24 beamline at the European Synchrotron Research Facility in Grenoble, they demonstrate a hundredfold improvement in sensitivity by measuring femtometre-scale atomic displacements in an iron–cobalt alloy undergoing magnetostriction. This advance should make EXAFS suitable for even more fields of study, and may be relevant to the design of instruments for new synchrotron radiation sources such as Diamond and Soleil.

Date: 2005
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DOI: 10.1038/nature03516

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