Abstract
The Γ8(4A2g) →Γ7(2T2g), Γ8(2T2g) electronic transitions for the 5d3 hexafluororhenate(IV) ion have been observed at liquid hydrogen temperature in a single Cs2GeF6 crystal and in a mixed crystal where the ReF−26 ion is doped in the cubic Cs2GeF6 lattice. The electronic transitions have been assigned with a crystal field model to give information about the parameters B, C, Dq, and spin-orbit coupling. The vibrational structure in the mixed crystal system may be assigned to the ungerade modes of the ReF−26 moiety. Comparison of the mixed and pure crystal vibrational structure shows that the pure crystal vibrational structure can be interpreted on the basis of K ≠ 0 lattice effects and a small distortion in the pure crystal.
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