For various samples of doped with Tm 3+ , different in structure and charge compensations, it has been possible to identify a point site symmetry with a symmetry for Tm 3+ . The analysis of the emission spectra measured at different temperatures and under different excitation sources (u.v. and cathode‐ray) permits the partial identification of the experimental splittings for , , , , , and levels. The energy level scheme deduced from the spectra is reasonably simulated by a set of free ion and crystal field parameters , , , , (fixed), (fixed), (fixed), , and .
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Charreire et al. (1983) studied this question.