Dynamical properties of water-methanol solutions studied by depolarized Rayleigh scattering

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Abstract
The dynamics of water in water-methanol solutions is studied by depolarized Rayleigh light scattering as a function of concentration and temperature. The obtained data give evidence of a well-defined maximum in the hydrogen bonding relaxation time at equimolar concentration. This phenomenon is consistent with the presence of well-defined shells of water around the methanol molecules as observed recently by means of a neutron diffraction experiment. In addition, our data show that the water rotational relaxation time increases with increasing solute concentration. This suggests that the water structure in these shells is more stable than bulk water structure at the same temperature. © 1996 The American Physical Society.