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The assignment of the H 2 O libratory vibrations in crystal hydrates to the rocking or wagging vibration alternatively using the isotope shift of the HDO librations is discussed. IR spectroscopic data on BaCl 2 · 2 H 2 O, BaBr 2 · 2 H 2 O, SrCl 2 · 2 H 2 O, BaCl 2 · H 2 O, BaBr 2 · H 2 O, SrCl 2 · H 2 O, SrBr 2 · H 2 O and on the deuterated compounds of these hydrates are included.
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Lutz et al. (1974) studied this question.
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