Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 115, Issue 28, Pages 8813-8820Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp202353c
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Funding
- Bavarian Science Foundation
- German Science Foundation (DFG) [GRK 1640, DFG-UL 174/7-1]
- Biotechnology and Biological Sciences Research Council (BBSRC)
- Engineering and Physical Sciences Research Council (EPSRC)
- Biotechnology and Biological Sciences Research Council [BB/G003831/1] Funding Source: researchfish
- BBSRC [BB/G003831/1] Funding Source: UKRI
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We have employed time-resolved spectroscopy on the picosecond time scale in combination with dynamic Monte Carlo simulations to investigate the photophysical properties of light-harvesting 2 (LH2) complexes from the purple photosynthetic bacterium Rhodopseudomonas acidophila. The variations of the fluorescence transients were studied as a function of the excitation fluence, the repetition rate of the excitation and the sample preparation conditions. Here we present the results obtained on detergent solubilized LH2 complexes, i.e., avoiding intercomplex interactions, and show that a simple four-State model is sufficient to grasp the experimental observations quantitatively without the need for any free parameters. This approach allows us to obtain a quantitative measure for the singlet-triplet annihilation rate in isolated, noninteracting LH2 complexes.
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