Abstract
The dependence of the relative average oxygen yield per flash ϕ for repetitive excitation with single flashes as a function of the dark time, t d, between the flashes has been investigated. The decrease of ϕ = f( t d) for long dark times ( t d) depends on the deactivation processes in the water-splitting system by which the number of precursors for photosynthetic oxygen evolution is diminished. It is shown that the rate of the deactivation reactions can be either accelerated or retarded by indophenols and nitrophenols. These effects can be clearly correlated to the acidity of the hydroxyl group of these substances, but other factors have also to be considered in order to interpret completely the mode of action of these agents in the deactivation process. Possible mechanisms are discussed.
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