Coherent intradimer dynamics in reaction centers of photosynthetic green bacterium Chloroflexus aurantiacus.

ABSTRACT: Early-time dynamics of absorbance changes (light minus dark) in the long-wavelength Q_y absorption band of bacteriochlorophyll dimer P of isolated reaction centers (RCs) from thermophilic green bacterium Chloroflexus (Cfx.) aurantiacus was studied by difference pump-probe spectroscopy with 18-fs resolution at cryogenic temperature. It was found that the stimulated emission spectrum gradually moves to the red on the ~100-fs time scale and subsequently oscillates with a major frequency of ~140 cm^-1. By applying the non-secular Redfield theory and linear susceptibility theory, the coherent dynamics of the stimulated emission from the excited state of the primary electron donor, bacteriochlorophyll dimer P*, was modeled. The model showed the possibility of an extremely fas

SUBMITTER: Yakovlev AG 

PROVIDER: S-EPMC6959224 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature