X-ray-absorption edge separation using diffraction anomalous fine structure

When two or more absorption edges in a material are sufficiently close in e nergy, extended-x-ray-absorption-fine-structure spectroscopy is of limited utility as the usable data range above the lower-energy edge is truncated b y the higher-energy edge. Energy or wavelength discriminating detection met hods may fail to resolve fluorescence lines which are very close in energy. In this paper we present a solution to this problem using the resolution i n momentum transfer of diffraction anomalous fine structure (DAFS) to separ ate the fine-structure signals from elements with closely spaced fluorescen ce lines. We demonstrate our technique by isolating the titanium edge signa l from DAFS measurements of BaTiO3.