Experimental Study of Rayleigh Scattering Related to Concentration Fluctuations in Binary Solutions: Evidence of a Departure from Ideality

The simultaneous determination of the two spectra of entropy and concentration fluctuations in a binary solution yields the Rayleigh ratio related to the concentration fluctuations. The results are in good agreement with the theoretical predictions. The departure from ideality of the solution is given by the evaluation of the term $\frac{\partial \mu }{\partial c}$.