Abstract
Picosecond transient and permanent hole burning spectroscopies are used to study the interaction between glycerol and the electronic states of the nonpolar solute dimethyl-s-tetrazine. Variable temperature measurements from the low temperature glass into the fluid region have identified a phonon-modulated interaction in agreement with a previous hypothesis [J. Chem. Phys. 94, 5787 (1991)]. However, this mechanism alone cannot account for the magnitude of the subpicosecond line broadening seen at room temperature. A second relaxation mechanism is identified, which is connected to the structural coordinates involved in the glass transition and reaches subpicosecond relaxation times at room temperature.
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