Abstract
The lowest triplet state T 1 of chlorophylls-a and -b, pheophytin-a, protochlorophyll and tetracene are investigated by a fluorescence detection method consisting of the measurement of fluorescence fading (FF) curves. Triplet state lifetimes of photosynthetic pigments in glassy solutions at 77 K, determined from the FF curves, are found to be dependent on the wavelength of fluorescence monitoring within the inhomogeneously broadened emission band. In the case of protochlorophyll, the double-exponential character of the FF curves is explained by suggesting the existence of two nearly degenerate triplet states below the S 1 state. Estimates for the yield of S 1 → T 1 interconversion are obtained. From the dependence of the T 1 population on excitation intensity it is estimated that the relative yield of the decay of the higher triplet state Tn to the ground state is about 0·2. From the FF curves measured at 4·2 K the lifetimes of the T 1 sublevels are calculated, and compared with magnetic resonance and pho...
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