Abstract
When plastoquinone QA (the electron acceptor) presents in one- or two-electron reduced states, the energy barrier between the radical pair and the excited photoactive chlorophyll ( ) in the photosystem II (PSII) reaction centers was estimated to be ~0.06 eV and ~0.12 eV, respectively (Safarova et al., 2023). In this study, the effect of the one- and two-electron reduced states of plastoquinone on the lifetime of the pair formed in the primary photochemical reaction in the PSII reaction center was evaluated. It has been shown that the lifetime of the pair formed when plastoquinone is doubly reduced is ≥10 times greater than when plastoquinone undergoes single reduction (recombination of charges, accordingly, occurs at a ≥10 times lower rate). The obtained result was compared with the existing experimental data. Keywords: Photosystem II, plastoquinone, charge recombination, lifetime
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