Exciton collision and fluorescence quenching in R-phycoerythrin

Xiguang Zheng; He Zhou Wang; Fuli Zhao; Zhaolan Gao; Zhenxin Yu; Jinchang Zhu; Andong Xia; Lijin Jiang

doi:10.1117/12.182764

17 August 1994 Exciton collision and fluorescence quenching in R-phycoerythrin

Xiguang Zheng, He Zhou Wang, Fuli Zhao, Zhaolan Gao, Zhenxin Yu, Jinchang Zhu, Andong Xia, Lijin Jiang

Proceedings Volume 2137, Time-Resolved Laser Spectroscopy in Biochemistry IV; (1994) https://doi.org/10.1117/12.182764
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Single ps pulse spectroscopic techniques have been employed to investigate excited-state dynamics of R-phycoerythrin (R-PE) isolated from two red algae Polysiphonia urceolata and Porphyra yezoensis, respectively, at various excitation photon densities in a range of 8 X 10¹⁴ $AP 1 X 10¹⁷ photons/cm². The fluorescence quantum yields of the R-PE from the two algae are found to decrease in logarithm with increasing of excitation intensity due to S₁-S₁ exciton collision. A fast component in addition to a slow one recorded at low excitation density and a large initial anisotropy are observed at higher excitation density. Different dynamical characteristics of exciton collision between the cases of Polysiphonia urceolata and Porphyra yezoensis are shown and proposed to be owing to different numbers of excited pigments available and chromophore architectrue in R-PE from different biological sources.

Citation Download Citation

Xiguang Zheng, He Zhou Wang, Fuli Zhao, Zhaolan Gao, Zhenxin Yu, Jinchang Zhu, Andong Xia, and Lijin Jiang "Exciton collision and fluorescence quenching in R-phycoerythrin", Proc. SPIE 2137, Time-Resolved Laser Spectroscopy in Biochemistry IV, (17 August 1994); https://doi.org/10.1117/12.182764

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