Radiationless Transitions and Deuterium Effect on Fluorescence Lifetimes of Some Aromatic Hydrocarbons

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Abstract
The fluorescence lifetimes of several perprotonated and perdeuterated aromatic hydrocarbons have been measured in rigid media at 77°K. Within experimental error, no change is found in lifetime upon substitution of deuterium for protium. It is concluded from this result that radiationless first excited singlet to ground singlet (S1→S0) transitions are unimportant in these systems. The fluorescence lifetime of anthracene at room temperature also compares favorably with that at low temperature, suggesting strongly that S1→T1 (first excited singlet to lowest triplet) radiationless processes in aromatics are temperature independent.