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Abstract
It has been found that action of the light in a longer wavelength region of the tryptophan triplet-triplet absorption in polar glass at 77 K leads to a reversible decrease of the phosphorescence intensity. This effect is accompanied by decreasing of a lifetime for phosphorescent state. It has been proved that a reversible decrease of tryptophan phosphorescence is a result of intermolecular process connected with deactivation of the triplet T 1-state by CO fragment of the carboxyl group. It seems that the reversible decrease of phosphorescence might be connected with a sufficiently fast process, which competes with a vibronical T 2 → T 1 relaxation.
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