Re-examination of primary radical pair recombination in Rp. viridis with QA reduced |
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| Institution: | 1. Department of Geography, University of Zaragoza, Zaragoza, Spain;2. Institute University of Research in Sciences Environmental (IUCA), University of Zaragoza, Zaragoza, Spain;3. Institute of Geophysics do Infante D. Luiz, University of Lisbon, Portugal;4. Earth Science Department, Barcelona Supercomputing Center (BSC), Barcelona, Spain |
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| Abstract: | Charge recombination in the primary radical pair P+H? of the purple photosynthetic bacterium Rp. viridis with pre-reduced secondary acceptor QA, has been studied by time-resolved photovoltage measurements and transient absorption spectroscopy with a time resolution of 1 ns. The lifetime of P+H? was found to be 2.4–3 ns in intact membranes and ～5 ns in isolated reaction centers, in contrast to a lifetime of ～15 ns which has been widely accepted in the literature for reaction centers. The origin of the difference between lifetimes of P+H? in membranes and isolated reaction centers is discussed. |
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