Abstract
X-ray-absorption near-edge structure (XANES) studies were performed at the ${L}_{\mathrm{III}}$ thresholds of Ce${\mathrm{O}}_{2}$ and Ce${\mathrm{F}}_{4}$ as a function of external pressure up to \ensuremath{\cong}267 kbar at room temperature. In both cases, the ${4f}^{0}$-related higher-energy component of the essentially double-peaked XANES structure decreases in relative intensity with pressure, opposite to what is generally observed for metallic mixed-valent Ce compounds. This supports the proposed peak assignment on the basis of core-hole induced many-body effects due to $4f$-ligand covalency compatible with traditional tetravalency of these compounds.
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