Abstract
The weakly absorbed 1.2-μ combination band of water was accurately studied as a function of temperature, in both its profile and first derivative, to obtain information on the bulk properties of liquid water. Arrhenius plots of integrated component intensity ratios showed well aligned experimental points, except for a neatly defined break occurring in the 30 to 40°C temperature interval for pure water A similar break, shifted by some 18°C towards lower temperature, was found in the case of 1M NaClO4 aqueous solutions. The breaks are tentatively assumed to result from abrupt though subtle changes involving low-frequency modes. This tentative, assumption appears independent of specific models and assignments and, although in agreement with available neutron-scattering and NMR data, needs more direct verification.
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Andaloro, G., Palma-Vittorelli, M.B. & Palma, M.U. Anomalies in the temperature dependence of the 1.2-μ absorption of liquid water. J Solution Chem 4, 215–224 (1975). https://doi.org/10.1007/BF00646558
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DOI: https://doi.org/10.1007/BF00646558