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Relaxational Dynamics and Strength in Supercooled Liquids from Impulsive Stimulated Thermal Scattering

Impulsive stimulated thermal scattering (ISTS), a time-domain light scattering technique, provides a more than 6-decade time range from sub-ns to many ms. It permits characterization of the structural relaxation dynamics and determination of the relaxation strength or Debye-Waller factor in supercooled liquids, and thus allows testing of the mode coupling theory of the liquidglass transition. ISTS experiments were performed on glass formers salol, butylbenzene, and the molten salt [Ca(N0 3 )] 0.4 [KNO 3 ] 0.6 . The relaxational dynamics and the Debye-Waller factorf q=0 were obtained. A square-root anomaly was observed in f q=0 (T) at a crossover temperature T c for all three materials, consistent with the prediction of mode coupling theory.