Structure and Molecular Interaction in HX–DX Mixed Crystals

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Abstract
The infrared spectra of mixed HCl–DCl and HBr–DBr crystals have been studied at 66°K in their lowest temperature crystalline phase over the entire composition range. It is demonstrated quantitatively that the observed spectra are those of linear zigzag chains in both cases. The magnitude of the interaction constant between displacements of neighboring molecules suggests that in the crystal ∂μ/∂r is about 2d/A for both molecules, more than twice the value in the free molecule.

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