Crystal Field Splitting of the Energy Levels of Nd3+ and Er3+ in CaWO4

Crystal field parameters appropriate for D2d symmetry were fit to data on the IJ4 level splittings of Nd3+:CaWO4. The symmetry assignments of the sublevels of I9/24 now seem firmly established. The “missing” sublevel in I11/24 was selected by comparing to existing Nd3+:PbMoO4 data. Spectral data which were used to interpret the I13/24 and I15/24 sublevel structure are presented. The total rms deviation for the I4 term without g-value fitting was 9.4 cm−1. When g-value fitting was included, the rms deviation was 10.7 cm−1. The total rms deviation for the F 4term of Er3+:CaWO4 was 7.2 cm−1.