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Figure 1
Simplified scheme of the catalytic cycle of water oxidation at the tetra-manganese complex of photosystem II. The S1 state is dark-stable. Application of one, two or three laser flashes results in the predominant population of S2, S3 and S0, respectively. The individual S states are acquired after the respective laser flash with the specified half-rise times. The indicated average oxidation states of the four Mn ions in the semistable S states follow the assignments made by Dau et al. (2003BB5). The S4 state is assumed to be transiently formed after the third flash. Its spontaneous conversion to the S0 state is coupled to the release of dioxygen.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 1| December 2005| Pages 35-44
doi:10.1107/S0909049504027803
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