On the neglecting of higher-order cumulants in EXAFS data analysis.
The cumulant expansion is one of the most powerful and useful methods for EXAFS data analysis, in which the higher-order cumulants allow to consider deviations from a simple Gaussian distribution. In this work, analytical expressions have been derived to show the effects of neglecting higher-order cumulants in EXAFS analysis by the ratio method. The errors in the best-fitting procedure owing to the omission of the higher-order cumulants, as well as of the coordination number, can be determined.
Università degli Studi di Verona, Facoltà di Scienze, Dipartamento di Informatica, Verona, Italy. andrea.sanson@univr.it
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Sanson