Abstract

The temperature effect on the infrared spectra of hydrogen bonded systems has been analysed in terms of a stochastic model. Two different sources of this effect on protonic vibration bands have been shown. For weaker hydrogen bonds with an asymmetric potential energy curve the main factor seems to be a lowering of the average bridge length with decreasing temperature. Numerical results regarding the coefficient dν OH/d T are in good agreement with experiment. In the case of moderately strong symmetric hydrogen bonds the main factor seems to be a population change of split tunnelling levels.

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