Abstract
The x-ray absorption near-edge structure (XANES) at the Np-L thresholds was investigated for Np compounds with formal valencies III to VII. At LIII, single and double-peaked white lines are observed corresponding to different final states that are populated through core excitation and 5f/ligand hybridization. For the non-metallic Np compounds studied, the weighted mean values of the LIII-XANES shifts relative to NpO2 exhibit a clear correlation with the isomer shifts of the 59-keV Mössbauer resonance of 237Np.
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