Abstract
Mass spectrometric studies above solid CdCl2 + CdBr2 mixtures in the temperature range 720-770 K have revealed the existence of "mixed halide" gaseous species of formula CdClBr. The heat of formation of CdClBr(g) from CdCl2(g) and CdBr2(g) has been found to be 0.4 � 1 kcal/mol. It is reasoned that the driving force for "mixed halide" formation is associated with a decrease in molecular symmetry.

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