Edge separation using diffraction anomalous fine structure.
We exploit the crystallographic sensitivity of the Diffraction Anomalous Fine-Structure (DAFS) measurement to separate the fine structure contributions of different atonfic species with closely spaced resonant energies. In BaTiO3 the Ti K edge and Ba Lm edges are separated by 281 eV, or about 8.2 .~-l , thus severely linfiting the information content of the Ti K edge signal. Using the site selectivity of DAFS we can separate the two fine structure spectra using an iterative Kramers-Kronig method, thus extending the range of the Ti K edge spectrum. This technique has application to many rare earth/transition metal compounds, including many magnetic materials of technological significance for which K and L edges overlap in energy.