Abstract
THE dependence of triplet state lifetimes on solvent viscosity noted in the first studies of triplet states in solution1 is due, in part, to quenching by trace impurities not yet identified2,3. Hoffman and Porter3 showed that, in certain molecules containing heavy atom substituents, the radiationless transition probability is increased to the point where it predominates over these trivial quenching processes and they conclude that, under these conditions, the measured lifetime corresponds to a true unimolecular radiationless conversion to the ground-state.
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References
Porter, G., and Windsor, M. W., Disc. Farad. Soc., 17, 178 (1954).
Jackson, G., Livingston, R., and Pugh, A. C., Trans. Farad. Soc., 56, 1635 (1960).
Hoffman, M., and Porter, G., Proc. Roy. Soc., A, 268, 46 (1962).
Hilpern, J., and Porter, G. (private communication).
Jackson, G., and Livingston, R., J. Chem. Phys., 35, 2182 (1961).
Porter, G., and Wright, M. R., Disc. Farad. Soc., 27, 18 and following discussion (1959).
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PORTER, G., STIEF, L. Viscosity Dependence of Unimolecular Conversion from the Triplet State. Nature 195, 991–992 (1962). https://doi.org/10.1038/195991b0
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DOI: https://doi.org/10.1038/195991b0
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