Fluorescence detection of white-beam X-ray absorption anisotropy: towards element-sensitive projections of local atomic structure

Abstract

Projections of the atomic structure around Nb atoms in a LiNbO(3) single crystal were obtained from a white-beam X-ray absorption anisotropy (XAA) pattern detected using Nb K fluorescence. This kind of anisotropy results from the interference of X-rays inside a sample and, owing to the short coherence length of a white beam, is visible only at small angles around interatomic directions. Consequently, the main features of the recorded XAA corresponded to distorted real-space projections of dense-packed atomic planes and atomic rows. A quantitative analysis of XAA was carried out using a wavelet transform and allowed well resolved projections of Nb atoms to be obtained up to distances of 10 Å. The signal of nearest O atoms was detected indirectly by a comparison with model calculations. The measurement of white-beam XAA using characteristic radiation indicates the possibility of obtaining element-sensitive projections of the local atomic structure in more complex samples.

DOI: 10.1107/S0909049511030688

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@inproceedings{Korecki2011FluorescenceDO, title={Fluorescence detection of white-beam X-ray absorption anisotropy: towards element-sensitive projections of local atomic structure}, author={Paweł Korecki and Martin Tolkiehn and K. M. Dąbrowski and Dmitri V Novikov}, booktitle={Journal of synchrotron radiation}, year={2011} }