title: Femtosecond stimulated Raman spectroscopy of the dark S1 excited state of carotenoid in photosynthetic light harvesting complex.
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.
authors.affiliation: Department of Physics, Tohoku University, Sendai, Japan. m-yoshizawa@m.tohoku.ac.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yoshizawa
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Nakamura
authors.forename: Orihiro
authors.initials: O
authors.lastname: Yoshimatsu
authors.forename: Kenta
authors.initials: K
authors.lastname: Abe
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Sakai
authors.forename: Katsunori
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Fujii
authors.forename: Mamoru
authors.initials: M
authors.lastname: Nango
authors.forename: Hideki
authors.initials: H
authors.lastname: Hashimoto
mesh_terms: D002338:Carotenoids / Q000737:chemistry*; D010788:Photosynthesis / Q000502:physiology; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry*; D012247:Rhodospirillum rubrum / Q000737:chemistry; D013059:Spectrum Analysis, Raman / Q000379:methods*; D024341:Xanthophylls / Q000737:chemistry
chemical_list: D045322:Photosynthetic Reaction Center Complex Proteins; D024341:Xanthophylls; D002338:Carotenoids; C055255:spirilloxanthin