Issue 14, 2012

Quantitative investigations of quantum coherence for a light-harvesting protein at conditions simulating photosynthesis

Abstract

Recent measurements using two-dimensional electronic spectroscopy (2D ES) have shown that the initial dynamic response of photosynthetic proteins can involve quantum coherence. We show how electronic coherence can be differentiated from vibrational coherence in 2D ES. On that basis we conclude that both electronic and vibrational coherences are observed in the phycobiliprotein light-harvesting complex PC645 from Chroomonas sp. CCMP270 at ambient temperature. These light-harvesting antenna proteins of the cryptophyte algae are suspended in the lumen, where the pH drops significantly under sustained illumination by sunlight. Here we measured 2D ES of PC645 at increasing levels of acidity to determine if the change in pH affects the quantum coherence; quantitative analysis reveals that the dynamics are insensitive to the pH change.

Graphical abstract: Quantitative investigations of quantum coherence for a light-harvesting protein at conditions simulating photosynthesis

Article information

Article type
Paper
Submitted
21 Nov 2011
Accepted
27 Jan 2012
First published
27 Jan 2012

Phys. Chem. Chem. Phys., 2012,14, 4857-4874

Quantitative investigations of quantum coherence for a light-harvesting protein at conditions simulating photosynthesis

D. B. Turner, R. Dinshaw, K. Lee, M. S. Belsley, K. E. Wilk, P. M. G. Curmi and G. D. Scholes, Phys. Chem. Chem. Phys., 2012, 14, 4857 DOI: 10.1039/C2CP23670B

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