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The far-infrared spectra of barium chloride dihydrate and its deutero analog were measured in the region of 60–4000 cm−1. The assignment of the infrared bands due to crystal water and crystal heavy water was made on the basis of the band frequency shift associated with deuteration. The optically-active lattice vibrations were calculated in order to assign the far-infrared bands and elucidate the nature of the vibrations.
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Fukushima et al. (1970) studied this question.
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