Rayleigh-Brillouin scattering spectra of the molecular glass former salol were combined with ultrasonic measurements to evaluate the non-ergodicity parameter of mode coupling theory ƒ0(T). A weak cusp was found at a temperature Tc = 275 K in reasonable agreement with the temperature found by...

Combined Raman, Brillouin and ultrasonic measurements have recently shown the existence, in salol, of a dynamical transition near 260 K. This transition is marked by a weak cusp in the non-ergodicity parameter, ƒ0(T), of the mode coupling theory. In parallel, we have also performed a neutron...