Dynamics of Excitation Energy Transfer between the Subunits of Photosystem II Dimer

Yusuke Yoneda; Tetsuro Katayama; Yutaka Nagasawa; Hiroshi Miyasaka; Yasufumi Umena

doi:10.1021/jacs.6b04316

Dynamics of Excitation Energy Transfer between the Subunits of Photosystem II Dimer

Yusuke Yoneda, Tetsuro Katayama, Yutaka Nagasawa, Hiroshi Miyasaka, Yasufumi Umena

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article

8 Citations (Scopus)

Abstract

Energy transfer dynamics in monomer and dimer of the photosystem II core complex (PSII-CC) was investigated by means of femtosecond transient absorption (TA) spectroscopy. There is no profound difference between the TA dynamics of the monomer and the dimer in the weak excitation intensity condition (≤21 nJ). However, the fast recovery of the ground state bleach was pronounced at higher excitation intensities, and the excitation intensity dependence of the dimer was more significant than that of the monomer. This result indicates efficient exciton-exciton annihilation taking place in the dimer due to energy transfer between the two monomer units. The annihilation dynamics was reproduced by a simple model based on binomial theorem, which indicated that although PSII-CC dimer has two reaction centers, only one charge-separated state remained after annihilation.

Original language	English
Pages (from-to)	11599-11605
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	138
Issue number	36
DOIs	https://doi.org/10.1021/jacs.6b04316
Publication status	Published - Sep 14 2016

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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Yoneda, Y., Katayama, T., Nagasawa, Y., Miyasaka, H., & Umena, Y. (2016). Dynamics of Excitation Energy Transfer between the Subunits of Photosystem II Dimer. Journal of the American Chemical Society, 138(36), 11599-11605. https://doi.org/10.1021/jacs.6b04316

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abstract = "Energy transfer dynamics in monomer and dimer of the photosystem II core complex (PSII-CC) was investigated by means of femtosecond transient absorption (TA) spectroscopy. There is no profound difference between the TA dynamics of the monomer and the dimer in the weak excitation intensity condition (≤21 nJ). However, the fast recovery of the ground state bleach was pronounced at higher excitation intensities, and the excitation intensity dependence of the dimer was more significant than that of the monomer. This result indicates efficient exciton-exciton annihilation taking place in the dimer due to energy transfer between the two monomer units. The annihilation dynamics was reproduced by a simple model based on binomial theorem, which indicated that although PSII-CC dimer has two reaction centers, only one charge-separated state remained after annihilation.",

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AU - Yoneda, Yusuke

AU - Katayama, Tetsuro

AU - Nagasawa, Yutaka

AU - Miyasaka, Hiroshi

AU - Umena, Yasufumi

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AB - Energy transfer dynamics in monomer and dimer of the photosystem II core complex (PSII-CC) was investigated by means of femtosecond transient absorption (TA) spectroscopy. There is no profound difference between the TA dynamics of the monomer and the dimer in the weak excitation intensity condition (≤21 nJ). However, the fast recovery of the ground state bleach was pronounced at higher excitation intensities, and the excitation intensity dependence of the dimer was more significant than that of the monomer. This result indicates efficient exciton-exciton annihilation taking place in the dimer due to energy transfer between the two monomer units. The annihilation dynamics was reproduced by a simple model based on binomial theorem, which indicated that although PSII-CC dimer has two reaction centers, only one charge-separated state remained after annihilation.

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