Intraband dynamics and exciton trapping in the LH2 complex of Rhodopseudomonas acidophila

Thyrhaug, E., Schröter, M., Bukartė, E., Kühn, O., Cogdell, R. , Hauer, J. and Zigmantas, D. (2021) Intraband dynamics and exciton trapping in the LH2 complex of Rhodopseudomonas acidophila. Journal of Chemical Physics, 154(4), 045102. (doi: 10.1063/5.0033802) (PMID:33514092)

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Abstract

Over the last several decades, the light-harvesting protein complexes of purple bacteria have been among the most popular model systems for energy transport in excitonic systems in the weak and intermediate intermolecular coupling regime. Despite this extensive body of scientific work, significant questions regarding the excitonic states and the photo-induced dynamics remain. Here, we address the low-temperature electronic structure and excitation dynamics in the light-harvesting complex 2 of Rhodopseudomonas acidophila by two-dimensional electronic spectroscopy. We find that, although at cryogenic temperature energy relaxation is very rapid, exciton mobility is limited over a significant range of excitation energies. This points to the presence of a sub-200 fs, spatially local energy-relaxation mechanism and suggests that local trapping might contribute substantially more in cryogenic experiments than under physiological conditions where the thermal energy is comparable to or larger than the static disorder.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard
Authors: Thyrhaug, E., Schröter, M., Bukartė, E., Kühn, O., Cogdell, R., Hauer, J., and Zigmantas, D.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Journal of Chemical Physics
Publisher:American Institute of Physics
ISSN:0021-9606
ISSN (Online):1089-7690
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Journal of Chemical Physics 154(4):045102
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172826DNA-directed construction of three-dimensional photosynthetic assembliesAlasdair ClarkBiotechnology and Biological Sciences Research Council (BBSRC)BB/N016734/1ENG - Biomedical Engineering