Abstract
The formation processes of solute excited states in liquid hydrocarbons have been studied by means of picosecond pulse radiolysis. Particularly, the study was focused to the very fast excitation process occuring within the duration of pulse, 10 picosecond. Effects of electron and hole scavengers on the luminescence from PPO ∗ in hydrocarbons were examined. Temperature effect on the excitation process was also examined. Contributions of geminate ion recombination and energy transfer to the excitation process were estimated. Finally, contribution of Cerenkov radiation generated in the medium by high energy electrons to the excitation process was evaluated. From those experimental results and discussions, it has been concluded that Cerenkov radiation is most important for the very fast excitation of solute molecules in dilute concentrations in any solvents.
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