The Analysis of EXAFS Spectra with Strongly Correlated Structural Parameters

Abstract

The Analysis of EXAFS Spectra with Strongly Correlated Structural Parameters

Srabionyan V.V., Avakyan L.A., Pryadchenko V.V., Dmitriev Yu,Yu., Bugaev L.A.

Incoming article date: 25.11.2014

The technique of determination of local atomic structure in the vicinity of absorbing atom in the case of the presence of strong correlation between fitting parameters is proposed. This technique is applied to three test signals simulating the Pt L3-edge EXAFS spectra of Pt/Ag bimetallic nanoparticles. The test results demonstrates the improvements in precision of determined parameters comparing with common technique.

Keywords: Extented X-ray Absorbtion Fine Structure, EXAFS, multiparameter curve fitting, correlation between fitting parameters, bimetallic nanoparticles, local atomic structures, CUDA