Optical Absorption and Fluorescence Spectra of Single-Crystal TbF3

Absorption and fluorescence measurements on a single crystal of TbF3 have been used to prepare an energy-level scheme for the Stark components of the 7F multiplet and the 5D4 level of Tb3+ in this crystal. The results are consistent with Cs site symmetry for the rare-earth ion. In addition a limited set of measurements indicate that the 5D4 level decays with lifetimes of 3.9 ± 0.4, 0.46 ± 0.05, and 0.30 ± 0.05 msec at 4.2, 77, and 300°K, respectively.

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