The luminescence studies of the delayed isothermal and light stimulated recombinations of photoejected electrons with photoionized chromophores at 77°K show that in the peptide tryptophyltyrosine, where energy transfer occurs at the singlet level from tryptophan to tyrosine and at the triplet level from tyrosine to tryptophan, tryptophan photoionization is greatly enhanced. This increase in photoionization efficiency is attributed to triplet‐triplet transfer.
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Santus et al. (1972) studied this question.
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