In the trichalcogenide family of compounds ${\mathrm{Zr}}_{1\mathrm{-}\mathit{x}}$${\mathrm{Hf}}_{\mathit{x}}$${\mathrm{S}}_3$ there is a frequency range where the optic modes are expected to be describable by a simple one-dimensional model. It is shown that the disorder-induced linewidth in the relevant frequency range could be consistent with theoretical calculations for a simple diatomic chain model. The vibrations involved are along the chain direction and are of ${\mathit{B}}_{\mathit{g}}$ type. All the ${\mathit{B}}_{\mathit{g}}$ modes of this family of compounds are also here unequivocally identified.

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