New technique for EXAFS data processing and its application

A new technique for analysis of the extended X-ray absorption fine structure is developed. It is proposed to separate out the oscillating part of the spectra on the basis of the variational principle. By analyzing the dependence of spectrum processing results on the Fourier transform window, the boundaries of the Fourier window are found within which the Fourier analysis of spectra yields the most correct results. Using the developed technique, the spectra of human ceruloplasmin near the $K$ edge of Cu and Li$_4$Ti$_5$O$_{12}$ compound near the $K$ edge of Ti were analyzed. The environment of Cu atoms in a ceruloplasmin molecule is hypothesized. The composition of the Li$_4$Ti$_5$O$_{12}$ sample is estimated.