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The X-ray structure analysis of photosystem (PS) I single crystals showed that the primary electron donor P700 is a heterodimer formed by one chlorophyll (Chl) a and one Chl a ' [Nature 411 (2001) 909]. The electronic structure of the cation radical P700 + of the primary donor, which is created in the charge separation process, has been probed by semiempirical molecular orbital...
The frozen solution electron paramagnetic resonance spectrum of the primary donor cation P + in reaction centers of site-directed mutants of Rhodobacter (Rb.) sphaeroides has been obtained at a microwave frequency ν=360 GHz and a magnetic field B 0 =12.8 T. Due to the high Zeeman resolution of the powder pattern, all three principal components of the rhombic g-tensors at T=160...
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