The ir transmission of the optical phonons for the mixed crystals ZnS<sub>1−<i>x</i></sub>Se<sub><i>x</i></sub>, and CdS<sub>1−<i>x</i></sub>Se<sub><i>x</i></sub>, at various concentrations of x, was studied as a function of pressure up to about 43 kbar. At all concentrations a two-mode behavior was observed. For both systems the high frequency mode exhibits a greater pressure dependence than the low frequency mode. The gap mode observed for the ZnS<sub>1−<i>x</i></sub>Se<sub><i>x</i></sub> mixed crystals at low concentrations of Se is found to be pressure insensitive as contrasted to the Cd<sub>1−<i>x</i></sub>Se<sub><i>x</i></sub> mixed crystals.

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