Low-frequency Raman spectra in water and in weak aqueous solutions. Spatial inhomogeneity in hydrogen peroxide solution

We describe some examples of the study of intermolecular interactions in water and in weak aqueous solutions using the low-frequency Raman spectra. An improved method of determining parameters of the dynamic susceptibility from the Raman spectra is described. The nine spectral parameters (the intensity, the frequency and the width of the two oscillators, the intensity and the width of the relaxation motion and the intensity of fluorescent background) completely describe the spectrum in the frequency range of 4 to 320 cm-1. For hydrogen peroxide the dependences of these parameters on the concentration is shown. Concentration dependence of the spectral parameters of the hydrogen peroxide solution in water indicates a change in the structure of the molecular bonds in water near a peroxide molecule at a distance up to 0. 7-0. 9 nm. The effect of the exciting laser radiation on the parameters of the spectra in the registration of the Raman spectra of water is shown. © 2012 Pleiades Publishing, Ltd.