Abstract
Temperature dependence of the excitation energy migration in liquid benzene was studied by monitoring the S 1-S 1 annihilation process induced by excitation with an intense picosecond (ps) 266 nm laser pulse. In the temperature region above ca. 20°C, the energy migration rate constant decreased with temperature lowering (which means that the energy migration is assisted by some thermally activated molecular motions), while, in the temperature region below ca.20°C down to the freezing point (5.5°C), the rate constant increased with temperature lowering. Such an increase of the rate constant with temperature lowering was not observed for the cyclohexane solution of benzene (50 vol %), where the usual Arrhenius type temperature dependence was demonstrated. These results suggest that a kind of short range excitonic state dependent upon the periodicity of liquid structure plays an important role in the energy migration in neat benzene at low temperature region.
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