Recombination dynamics in bacterial photosynthetic reaction centers

Recombination dynamics in bacterial photosynthetic reaction centers.

The time dependence of magnetic field effects on light absorption by triplet-state and radical ions in quinone-depleted reaction centers of Rhodopseudomonas sphaeroides strain R-26 has been investigated. Measurements on the time scale of the hyperfine interaction in the radical pair [(BChl)2+. ...BPh-.)] provided kinetic data characterizing the recombination process. The results have been inter...

Effects of nuclear spin polarization on reaction dynamics in photosynthetic bacterial reaction centers.

Singlet-triplet mixing in the initial radical-pair state, P[unk]I[unk], of photosynthetic bacterial reaction centers is due to the hyperfine mechanism at low magnetic fields and both the hyperfine and Deltag mechanisms at high magnetic fields (>1 kG). Since the hyperfine field felt by the electron spins in P[unk]I[unk] is dependent upon the nuclear spin state in each radical, the relative proba...

Photosynthetic reaction centers.

The capture of solar radiation and the conversion of its free energy into chemical energy involves a sequence of reactions that occur within a physical structure called the photosynthetic RC. Following the initial capture of a photon by antenna pigments, the photon is transferred to the RC pigments, where it gives rise to a separation and stabilization of charge across the photosynthetic membra...

Primary Charge Separation in Photosynthetic Bacterial Reaction Centers and Femtosecond Solvation Dynamics

single pass Bethune type cell using LDS-867 to an energy of about 4 μJ. The second continuum was used as the probe pulse. The polarization of the pump and probe pulses were generally set at the magic angle, although experiments were also performed with parallel and perpendicular polarizations. The instrument response function, determined by monitoring the bleaching of the dye IR-143, was typica...

Reaction centers of photosynthetic bacteria.