Features of the Distribution of Spectral Parameters of Intermolecular Vibrations in Water Obtained by Raman Spectroscopy

摘要

Using Raman scattering, we have studied the spectral characteristics of intermolecular vibrations of water that are associated with low- (about 50 cm(-1) in the IR absorption spectrum) and high-frequency (183.4 cm(-1) in the IR absorption spectrum) vibrations of water molecules. Our consideration is based on the notion of a classical damping oscillator. In the (squared width-squared frequency) coordinates, band characteristics of any vibration are represented by a point. We show that the set of experimentally obtained points is distributed inhomogeneously in a certain area of this coordinate system. We have found that, for each vibration within the corresponding area, the points are located in two close parts (subareas), which are separated by a strip that is almost free of points. Mathematical processing has revealed the occurrence of a small-scale inhomogeneity in the distribution of points. The question of whether the detected inhomogeneity of the spectral parameters reflects actually existing states in water requires further research.