Abstract
Structural relaxation in liquids on a wide time scale has been studied by time-resolved transient hole-burning spectroscopy. Time evolution of a hole with a long lifetime that is due to a long triplet-state lifetime has been measured in the systems of merbromin in glycerol and propylene glycol, and also in the systems of Zn protoporphyrin in glycerol dimethylformamide mixtures over the temperature range 180–300 K and time range 1 μs -10 ms. The temporal shift of the hole has revealed nonexponential dynamics of liquids and has been well reproduced by a stretched exponential function. The temperature dependence of the relaxation time has been compared with the results of dielectric relaxation measurements.
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