Abstract
Femtosecond transient absorption spectroscopy was used to study the dynamics of the excited primary electron donor in the reaction centers of the purple bacterium Rhodobacter sphaeroides. Using global analysis and the interval method, we found a correlation between the vibrational coherence damping of the excited primary electron donor and the lifetime of the charge-separated stateP+BA-, indicating the reversibility of electron transfer to the primary electron acceptor, theBA molecule. In the reaction centers, the signs of superposition of two electronic states of P were found for a delay time of less than 200fs. It is suggested that the admixture value of the charge transfer statePA+PB- with the excited primary electron donorP* is about 24%. The results obtained are discussed in terms of the two-step electron transfer mechanism.
Published Version
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