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Data from two dimensional electronic spectroscopy showing that photosynthesis tunes quantum-mechanical mixing of electronic and vibrational states to steer exciton energy transfer

Citation

Higgins, Jacob et al. (2021), Data from two dimensional electronic spectroscopy showing that photosynthesis tunes quantum-mechanical mixing of electronic and vibrational states to steer exciton energy transfer, Dryad, Dataset, https://doi.org/10.5061/dryad.0rxwdbrzd

Abstract

Raw data from an ultrafast two dimensional electronic spectrometer investigating a series of mutants from the Fenna-Matthews Olson photosynthetic complex from Chlorobaculum tepidum is included here.  This data was analyzed and reduced using the enclosed matlab scripts to show that this complex responds to changing oxidation conditions by breaking a resonance between a gap between electronic states and an attendant vibration within the bacteriochlorophyll molecules. Breaking this resonance steers energy differently through the complex and enables a photoprotective response that increases quenching of the absorbed excitation.  In this regard, using simply the oxidation of two cysteine residues, the complex then manipulates this quantum mechanical vibronic coupling to redirect energy transfer and protect the organism from photooxidative damage. This dataset includes raw and reduced data including scripts for fitting trends, time constants, and modelling the data using a Redfield model.  This work is being published in Higgins et al., "Photosynthesis tunes quantum-mechanical mixing of electronic and vibrational states to steer exciton energy transfer", PNAS, March 8, 2021.