DYNAMIC LIGHT-SCATTERING-STUDIES OF LONGITUDINAL AND SHEAR-WAVES IN A MOLECULAR LIQUID

We have obtained new light scattering data on triphenylphosphite in both the viscoelastic and glassy regimes. We have developed a means of studying the Brillouin lineshapes and have determined that they are Lorentzian throughout. We found that in the glass the Brillouin linewidth increases with the rate of thermal quenching. And we analyzed the linewidth and shift data, both ours and that of others, in terms of the variable keta, where k is the scattering wavevector and eta is the coefficient of shear viscosity; we discuss the weaknesses and strengths of such an analysis.