Abstract
Measurements of the IR spectra are made on thin-film water cryovacuum condensates formed on a metal substrate in the temperature range 16–200 K. It is found that the frequency of molecular stretching vibrations are shifted to lower frequencies with increasing temperature; this is explained by a weakening of the hydrogen bond. A calculation of the change in H-bond enthalpy shows that this change is larger for thinner samples. A fine structure of the librational bands of intramolecular protonic transitions in the cryocondensate is revealed. It may be due to the different orientations of the molecules relative to the internal field in samples formed at different temperatures.