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Standard reduction potentials [volts vs. NHE normal hydrogen electrode)] per electron for oxidation of water, aqueous bicarbonate, the 1:2 dimanganese/bicarbonate complex, Mn2(HCO3)4, and the photooxidizable reaction center pigment found in cyanobacteria and higher plants (P680; Chl-a), purple bacteria and green bacteria (P870; BChl-a), and heliobacteria (P798; BChl-g) (31). Energies of the excited states (P*) are in electron volts.
