Abstract
We have measured depolarized light scattering in liquid benzeneover the whole accessible temperature range and over fourdecades in frequency. Between 40 and 180 GHz we find asusceptibility peak due to structural relaxation. This peakshows stretching and time-temperature scaling as known fromalpha relaxation in glass-forming materials. A simplemode-coupling model provides consistent fits of the entire dataset. These qualitative and quantitative results show thatstructural relaxation in ordinary liquids and alpharelaxation in glass-forming materials are one and the samephysical process. Thus, a deeper understanding of equilibriumliquids is reached by applying concepts that were originallydeveloped in the context of glass-transition research.
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