Tcof the Mode Coupling Theory Evaluated from Impulsive Stimulated Light Scattering on Salol

Time-domain light scattering on ns–ms time scales has been performed on salol to probe the dynamics in the glass transition range and evaluate through a novel method the nonergodicity parameter $f_q\left(T\right)$ of mode coupling theory (MCT) in the wave vector limit $q\to 0$. Stretched-exponential structural relaxation dynamics were observed. In addition, a cusp in $f_0\left(T\right)$ was observed at a temperature $T_c$ of $\sim 266$ K, consistent with earlier observations at high $q$. This supports the MCT prediction of a cusp at a $q$-independent temperature.