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Time-dependent reversion of the S2t to the S2 state upon incubation at 62 K in the presence of H2O (rectangles) or D2O (circles). The maximal S2t occupancy was obtained by illumination of the S2 state at 150 K. Single exponential functions plus offsets were fitted to the experimental points with rate constants of 0.415 min–1 in H2O and 0.057 min–1 in D2O.
