Observation of Coherence in the Photosystem II Reaction Center

TL;DR

This paper reports the observation of electronic and vibrational coherence in the photosystem II reaction center using two-dimensional electronic spectroscopy, suggesting a potential role in the fundamental charge separation process of photosynthesis.

Contribution

It provides the first direct evidence of coherence in the photosystem II reaction center, linking spectroscopic signals to energy transfer and charge separation mechanisms.

Findings

Observed coherence matching exciton difference frequencies

Detected vibrational modes of the reaction center

Raised questions about coherence's role in charge separation

Abstract

Photosynthesis powers life on our planet. The basic photosynthetic architecture comprises antenna complexes to harvest solar energy and reaction centers to convert the energy into a stable charge separated state. In oxygenic photosynthesis, the initial charge separation event occurs in the photosystem II reaction center; the only known natural enzyme that uses solar energy to split water. Energy transfer and charge separation in photosynthesis are rapid and have high quantum efficiencies. Recently, nonlinear spectroscopic experiments have suggested that electronic coherence may play a role in energy transfer efficiency in antenna complexes. Here we report the observation of coherence in the photosystem II reaction center by two dimensional electronic spectroscopy. The frequencies of the observed coherences match exciton difference frequencies and/or known vibrational modes of the photosystem II reaction center. These observations raise questions about the possible role of electronic and/or vibrational coherence in the fundamental charge separation process in oxygenic photosynthesis.