Abstract
Abstract Absorption and emission measurements at liquid-helium temperature, liquid-nitrogen temperature and room temperature have been performed on tetragonal scheelite-type rare earth sodium double molybdates Na 5 RE(MoO 4 ) 4 and on RE-doped Na 5 Gd(MoO 4 ) 4 samples. The rare earth occupies one single crystallographic position with S 4 as point symmetry. The spectra were analysed according to the crystal field theory. From the experimental data, nearly complete energy level schemes of the Pr 3+ and Nd 3+ , on the 4f 2 and 4f 3 configurations were derived. Very good correlation was obtained between the experimental and simulated energy level schemes, first for the approximated D 2 d and then for the true S 4 symmetries. The crystal field parameters vary smoothly with the atomic number of the rare earth, when compared with those determined previously for Eu 3+ in the same matrix.
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