Femtosecond stimulated Raman spectroscopy of the dark S1 excited state of carotenoid in photosynthetic light harvesting complex.

Masayuki Yoshizawa; Ryosuke Nakamura; Orihiro Yoshimatsu; Kenta Abe; Shunsuke Sakai; Katsunori Nakagawa; Ritsuko Fujii; Mamoru Nango; Hideki Hashimoto

doi:10.18388/abp.2012_2169

Femtosecond stimulated Raman spectroscopy of the dark S1 excited state of carotenoid in photosynthetic light harvesting complex.

Masayuki Yoshizawa Department of Physics, Tohoku University, Sendai, Japan. m-yoshizawa@m.tohoku.ac.jp;
Ryosuke Nakamura
Orihiro Yoshimatsu
Kenta Abe
Shunsuke Sakai
Katsunori Nakagawa
Ritsuko Fujii
Mamoru Nango
Hideki Hashimoto

DOI: https://doi.org/10.18388/abp.2012_2169

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.

Published

2012-03-17

Issue

Vol. 59 No. 1 (2012)

Section

Articles

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