Depolarized Rayleigh scattering in water up to supercritical conditions

Publisher Website
Google Scholar
Abstract
Depolarized Rayleigh spectra of water have been measured as a function of density along several isotherms in both liquid and supercritical phases. At all the thermodynamical states the spectral line shape can be fitted by a Lorentzian line superimposed to an exponential background. The behavior of the fitting parameters shows that at temperatures lower than ∼470 K the temperature is the most relevant parameter in determining the dynamics of the system, whereas above this temperature both temperature and density play a relevant role. Both the line shape and intensity of the spectra can be consistently interpreted in the framework of the first‐order dipole induced dipole approximation to the collision‐induced light scattering. The data show a clear evidence for cancellation effects.