Hidden vibronic and excitonic structure and vibronic coherence transfer in the bacterial reaction center.

ABSTRACT: We report two-dimensional electronic spectroscopy (2DES) experiments on the bacterial reaction center (BRC) from purple bacteria, revealing hidden vibronic and excitonic structure. Through analysis of the coherent dynamics of the BRC, we identify multiple quasi-resonances between pigment vibrations and excitonic energy gaps, and vibronic coherence transfer processes that are typically neglected in standard models of photosynthetic energy transfer and charge separation. We support our assignment with control experiments on bacteriochlorophyll and simulations of the coherent dynamics using a reduced excitonic model of the BRC. We find that specific vibronic coherence processes can readily reveal weak exciton transitions. While the functional relevance of such processes is unclear, they provi

SUBMITTER: Policht VR 

PROVIDER: S-EPMC8730630 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature