Temperature dependence of depolarized spectra in n-propanol

The liquid-glass transition in n-propanol has been investigated from the temperature dependence of the depolarized spectra by the Brillouin scattering. The fitting analyses were performed using the Davidson-Cole formula. The relaxation time obtained was one order higher than the one already reduced from the polarized spectra using the spectral function of the viscoelastic theory. It was found that the relaxation in the depolarized spectra, differed from the relaxation coupling with the longitudinal acoustic phonon in the polarized spectra. Moreover, the relaxation in the depolarized spectra corresponds to the combined relaxation of II- and III-peaks appearing in the higher frequency side of the strongest I-peak for dielectric data. (C) 1999 Elsevier Science B.V. All rights reserved.