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

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

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)


    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 languageEnglish
    Pages (from-to)11599-11605
    Number of pages7
    JournalJournal of the American Chemical Society
    Issue number36
    Publication statusPublished - Sep 14 2016

    ASJC Scopus subject areas

    • Catalysis
    • Chemistry(all)
    • Biochemistry
    • Colloid and Surface Chemistry


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