X-ray Absorption Spectroscopy (XAS)

X-ray absorption spectroscopy (XAS) measures the energy-dependent X-ray absorption of a target element near and above its absorption edge, providing element-specific information on oxidation state, coordination environment, and local atomic structure through the XANES and EXAFS regions. As a hard skill it requires preparing samples with correct thickness and homogeneity for transmission or fluorescence detection, collecting reference compounds for edge comparison and linear-combination fitting, and analyzing EXAFS with software packages such as Athena and Artemis. Battery researchers apply XAS operando to track transition-metal oxidation-state changes in cathodes and to characterize local structure around active elements in amorphous and nanocrystalline materials.

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