Abstract

The ground level 3H6 of Tm3+ ions in a number of crystals has been examined through the matrix elements of spin – orbit interaction. The latter have been determined comparable with the separation between 3H6 and the first excited level 3F4. The normalized ratios of spin – orbit interactions relative to the free ion value of Tm IV as a function of the scalar crystal field parameter Nv have been found to vary analogous to the nephelauxetic effect. The relationships between maximum splitting of 3H6, spin-orbit coupling constant, crystal-field parameters and the Nv have been also studied for the presented 42 stoichiometric or doped crystals containing Tm3+. The compounds include halogenides, organic complexes, oxides, oxohalides, and semiconductors.

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