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Excitation spectra of near-infrared photoluminescence from Np(VI) in Cs2U(Np)O2Cl4

Abstract Excitation spectra between 13200 and 21275 cm-1 at 75 K are reported for single crystals of Cs2U(Np)O2Cl4. These excitation spectra are collected from an infra-5f near-infrared luminescence origin of the neptunyl ion, and the energies and intensities of the spectral transitions are consistent with 4.2 K plane-polarized absorption spectra reported by Denning.