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A method of investigating resonance energy transfer in mixed molecular crystals by electric field switching

The use of a Stark switching technique to observe triplet state (T1) excitation energy transfer between p‐methoxybenzaldehyde (MBA) molecules in a p‐dimethoxybenzene host crystal at 4.2 K is described. The results indicate that T1 is a ππ* state and that the rate of energy transfer is very slow, only 3 s−1.