Abstract
The dynamics of ethanol in its plastic crystalline and supercooled liquid state hasbeen measured using triplet state solvation dynamics techniques. This studyfocuses on temperatures near the respective glass transitions Tgof the two distinct phases, where the structural relaxation times are between 1ms and 10 s. In the plastic crystal, the correlation times of the Stokesshift dynamics match the longitudinal time constants of the system asderived from dielectric relaxation data. Additionally, a maximum of thetime resolved optical linewidths is indicative of heterogeneous dynamicsin the plastic crystal. The supercooled liquid state is obtained afterquenching the liquid from room temperature to below Tgand displays relaxation times that are a factor of 100 faster compared withthe plastic crystal at the same temperature. The results do not revealdifferent translational contributions to solvation for the two phases.
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