Vibrational relaxation of water molecules near room temperature

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The vibrational de-excitation process H2O(010)+H2O(000) →H2O(000)+H2O(000) has been investigated to determine its temperature dependence at low temperatures recognizing the manifestation of strong molecular attraction at such temperatures and considering the transfer of vibrational energy to both the oscillatory motion of weakly-bound complexes and the free rotational motion. The model predicts large values of the de-excitation probability with a strong negative temperature dependence in 200–400 °K; the probability varies from 0.46 at 200 °K to 0.16 at 400 °K.