Fig. 1: Data analysis on XANES and EXAFS spectra. | Nature Communications

Fig. 1: Data analysis on XANES and EXAFS spectra.

From: In situ X-ray spectroscopies beyond conventional X-ray absorption spectroscopy on deciphering dynamic configuration of electrocatalysts

Fig. 1

a A typical XAS spectrum consisting of XANES and EXAFS regions, inset is the quantitative parametrization of EXAFS spectra. b–e Methods of determination of oxidation state from the XANES spectra corresponding to a Cu-based mixture sample: b first derivative; c half height intensity; d integral method; and e linear combination fitting. An equation used to define an average edge energy is inserted in (d), in which the inverse function E(μ) of the spectrum is integrated between μ1 and μ2. f Cu K-edge EXAFS spectrum for a Cu-based mixture sample and its Fourier and wavelet transforms. Nyquist criterion estimating the upper bound of the number of independent variables for EXAFS fitting.

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