Abstract

Recently we reported that some of the charge-transfer bands of CoBr₄⁼ which are ordinarily obscured by the absorption of Br⁻ can be resolved in thin films of (Bu₄P⁺)₂CoBr₄⁼.¹ Apparently the concentration of free Br⁻ is so small under these conditions that it permits the detection of CoBr₄⁼ bands in the same region. Here we note that it is also possible to observe at least the first component of the absorption band of Br⁻ by the same technique.

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