Quenching and Energy Transfer by the Same Substance

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Abstract
The quenching by 0‐terphenyl of the gamma‐ray induced fluorescence of 0‐xylene/9,10‐diphenylanthracene solutions does not give the usual linear dependence of I0/I on quencher concentration. The effect is ascribed to a quencher concentration‐dependent energy transfer from the solvent to 0‐terphenyl which has a finite transfer probability to the fluorescent solute. This interpretation is confirmed by the enhancement of energy transfer caused by the addition of 0‐terphenyl to a solution of a fluorescent solute in tri‐n‐butylphosphate, a solvent having a very low transfer efficiency.