Primary processes in the bacterial reaction center probed by two-dimensional electronic spectroscopy.

ABSTRACT: In the initial steps of photosynthesis, reaction centers convert solar energy to stable charge-separated states with near-unity quantum efficiency. The reaction center from purple bacteria remains an important model system for probing the structure-function relationship and understanding mechanisms of photosynthetic charge separation. Here we perform 2D electronic spectroscopy (2DES) on bacterial reaction centers (BRCs) from two mutants of the purple bacterium Rhodobacter capsulatus, spanning the Q _y absorption bands of the BRC. We analyze the 2DES data using a multiexcitation global-fitting approach that employs a common set of basis spectra for all excitation frequencies, incorporating inputs from the linear absorption spectrum and the BRC structure. We extract t

SUBMITTER: Niedringhaus A 

PROVIDER: S-EPMC5889668 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature