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The optical difference spectrum of the excited primary electron donor, P*, in Rb. capsulatus reaction centers has been measured 600 fs after a 350-fs flash at 870 nm. The spectrum is characterized by bleaching in the ground state absorption bands at 855 and 600 nm, and a weak featureless transient absorption in between. The lack of significant (if any) bleaching at 800 nm indicates that P does not...
The primary charge separation process in reaction centers isolated from the green photosynthetic bacterium Chloroflexus aurantiacus has been investigated with picosecond transient absorption techniques. Transient spectra and kinetics are compared with those obtained under identical conditions on reaction centers from the purple bacterium Rhodopseudomonas sphaeroides. An early electron acceptor complex...
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