Abstract
Laser-induced fluorescence(LIF) studies of Sm(III) and Cm(III) complexes in the HNO3/DHDECMP solvent extraction system have been carried out. Luminescence lifetime together with LIF spectra were measured to determine the number of water molecules coordinated to Sm(III) and Cm(III) in a nitric acid solution and in the DHDECMP phase. The hydration number of Sm(III) and Cm(III) in the nitric acid solution decreased linearly with an increasing nitric acid concentration. The hydration numbers of Sm(III) and Cm(III) in the DHDECMP phase decreased with an increase of nitric acid concentration and the water molecules in the inner coordination sphere were not completely removed at the low nitric acid concentration.
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