Abstract

The influence of electrolyte concentration on the water libration spectrum was studied by four-photon polarization spectroscopy. The results were compared with the data on stretching O–H vibrations observed in spontaneous Raman spectroscopy in water solutions of electrolytes, and a qualitative coincidence of these results was found. It is shown that the weakening of hydrogen bonds at low electrolyte concentrations and the strengthening of coupling between water molecules and ions at high concentrations shift the libration resonances to high and low wavenumbers, respectively. Copyright © 2000 John Wiley & Sons, Ltd.

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