Femtosecond stimulated Raman spectroscopy of the dark S1 excited state of carotenoid in photosynthetic light harvesting complex |
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Authors: | Yoshizawa Masayuki Nakamura Ryosuke Yoshimatsu Orihiro Abe Kenta Sakai Shunsuke Nakagawa Katsunori Fujii Ritsuko Nango Mamoru Hashimoto Hideki |
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Affiliation: | Department of Physics, Tohoku University, Sendai, Japan. m-yoshizawa@m.tohoku.ac.jp |
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Abstract: | Vibrational dynamics of the excited state in the light-harvesting complex (LH1) have been investigated by femtosecond stimulated Raman spectroscopy (FSRS). The native and reconstituted LH1 complexes have same dynamics. The ν(1) (C=C stretching) vibrational mode of spirilloxanthin in LH1 shows ultrafast high-frequency shift in the S(1) excited state with a time constant of 0.3 ps. It is assigned to the vibrational relaxation of the S(1) state following the internal conversion from the photoexcited S(2) state. |
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