Abstract:
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.