Redox conditions correlated with vibronic coupling modulate quantum beats in photosynthetic pigment-protein complexes.

ABSTRACT: Quantum coherences, observed as time-dependent beats in ultrafast spectroscopic experiments, arise when light-matter interactions prepare systems in superpositions of states with differing energy and fixed phase across the ensemble. Such coherences have been observed in photosynthetic systems following ultrafast laser excitation, but what these coherences imply about the underlying energy transfer dynamics remains subject to debate. Recent work showed that redox conditions tune vibronic coupling in the Fenna-Matthews-Olson (FMO) pigment-protein complex in green sulfur bacteria, raising the question of whether redox conditions may also affect the long-lived (>100 fs) quantum coherences observed in this complex. In this work, we perform ultrafast two-dimensional electronic spectroscopy measu

SUBMITTER: Higgins JS 

PROVIDER: S-EPMC8670468 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature