Partial pair correlation functions for multicomponent systems by EXAFS: A new approach

A method of determining partial pair correlation functions (pPCFs) for multicomponent systems from EXAFS data is presented. The method is based upon the regularization procedure of solving a Fredholm integral equation of the first kind using special iteration procedure. The effectiveness of the method has been tested on the model crystalline solids ZnBr2. We present the result for ZnBr2 aqueous solution obtained from experimental data at room temperature (303 K) and pressure 250 bar. Experiments were performed using an unique equipment at ESRF (Grenoble, France). Peculiar features of the method are high resolution for closely spaced shells and high accuracy in the determination of pPCFs.