Open AccessFluorescence detection of white‐beam X‐ray absorption anisotropy: towards element‐sensitive projections of local atomic structure
Author(s) -
Korecki P.,
Tolkiehn M.,
Dąbrowski K. M.,
Novikov D. V.
Publication year - 2011
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049511030688
Subject(s) - anisotropy , beam (structure) , absorption (acoustics) , x ray absorption fine structure , extended x ray absorption fine structure , materials science , optics , chemistry , absorption spectroscopy , spectroscopy , physics , quantum mechanics
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.