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A theoretical investigation has been made of the dependence of the shape and breadth of the absorption band for stretching vibrations V O H in hydrogen bonds of an alcohol crystal on the concentration of an isotopic impurity. It is shown that the structure of the V O H band is caused by Davydov splitting. The local mode frequencie8 arising 011 deuteration of an individual alcohol molecule are calculated using the Green's function method and the introduction of such impurity molecules into the crystal is found to lead to an effective drsintegration of the hydrogen-bonded chain to shorter chains. A method is proposed of constructing the absorption V O H band contour. The V O H absorption band contour is constructed for various concentrations of deuterated molecules under the assumption of their random distribution. The splitting of the V O H doublet decreases with increasing concentration of deoterated molecules, owing to the effective decrease of the lengths of the chain formed by hydrogen bonds in an alcohol crystal. QJIH KpHcTanna cnHpTa TeopeTwrecm m y s e~a ~~B H C M M O C

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