Abstract

The observation that the v2(eg) band is the most enchanced Raman band at resonance with the bands assigned to both the 3T1u ← 1A1g and 1T1u ← 1A1g transitions of the [TeX6]2− ions indicates that the ions are tetragonally distorted in these excited states. The depolarisation ratio of 2v2 band of [TeBr6]2− at resonance with the 1T1u ← 1A1g transition is found to be 0.18, in close agreement with that expected (3/14) for the first overtone of a doubly degenerate vibration coupled to a triply degenerate excite state.

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