Upon laser photolysis of chlorophyll‐quinone solutions in ethanol, transients due to the chlorophyll triplet state ( C t ), the chlorophyll cation radical (C + ) and the semiquinone radical (Q ‐ ) can be observed. The rise of Q ‐ parallels the decay of C t . demonstrating the precursor role of the triplet. The decay of C + is second order, consistent with reverse electron transfer, and has a rate constant which is independent of quinone potential, and an activation energy of 14kJ/mol due mainly to the temperature dependence of solvent viscosity. Triplet quenching and C + yield are found to decrease with decreasing quinone potential.
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Tollin et al. (1979) studied this question.
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