Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Polarized Raman spectra of water in the ν(OH) and δ(OH<jats:sub>2</jats:sub>) regions have been recorded for aqueous solutions of electrolytes of types AB and AB<jats:sub>2</jats:sub> (A = Li, Na, K, Ca; B = Cl, Br, I, NO<jats:sub>3</jats:sub>) over a wide concentration range. Variations in frequencies, intensities, band shapes and band widths with changes in concentration and in the nature of the ions are discussed.</jats:p><jats:p>The isotropic and anisotropic components of the intensity of the ν(OH) band have been analysed as a function of concentration. It is found that the function 45(a')<jats:sup>2</jats:sup> is approximately independent of, or decreases slightly with, the concentration of the alkali metal halides whereas for the nitrates it increases linearly with concentration. The function 3(γ′)<jats:sup>2</jats:sup> increases very slowly with concentration for both halides and nitrates. These results have been compared with those obtained for pure water when the temperature is varied over the range −20 to 120°C.</jats:p><jats:p>Despite the difference in nature of the two types of perturbation (ionic and thermal), all the results can be interpreted in terms of modifications of intra‐and inter‐molecular couplings and Fermi resonance between vibrational modes of water molecules.</jats:p>