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

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