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Vibrational Modes Promoting Exciton Relaxation in the B850 Band of LH2

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Title
Vibrational Modes Promoting Exciton Relaxation in the B850 Band of LH2
Author(s)
Kim, Junwoo; Nguyen-Phan, Tu C.; Gardiner, Alastair T.; Tai Hyun Yoon; Cogdell, Richard J.; Minhaeng Cho; Scholes, Gregory D.
Publication Date
2022-02
Journal
Journal of Physical Chemistry Letters, v.13, no.4, pp.1099 - 1106
Publisher
American Chemical Society
Abstract
© 2022 American Chemical Society.Exciton relaxation dynamics in multichromophore systems are often modeled using Redfield theory, where bath fluctuations mediate the relaxation among the exciton eigenstates. Identifying the vibrational or phonon modes that are implicated in exciton relaxation allows more detailed understanding of exciton dynamics. Here we focus on a well-studied light-harvesting II complex (LH2) isolated from the photosynthetic purple bacterium Rhodoblastus acidophilus strain 10050. Using two synchronized mode-locked lasers, we carried out a polarization-dependent two-dimensional electronic spectroscopy (2DES) study of an ultrafast exciton relaxation in the B850 band of LH2. 2DES data with different polarization configurations enable us to investigate the exciton relaxation between the k = ±1 exciton states. Then, we identify vibrational modes coupled to the exciton relaxation by analyzing the coherent wavepackets in the 2DES signals. Focusing on the coherent vibrational wavepackets, the data suggest that certain symmetry-breaking modes of monomeric units play a key role in exciton relaxation.
URI
https://pr.ibs.re.kr/handle/8788114/11602
DOI
10.1021/acs.jpclett.1c03868
ISSN
1948-7185
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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