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Fluorescence depolarization dynamics in the B850 complex of purple bacteria
Institution:1. Institut für Chemie, Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany;2. Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden;1. Department of Electrical Engineering, IIT Madras, Tamilnadu 641003, India;2. Santa Fe Partners, Santa Fe, New Mexico, U.S.;1. Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan;1. Photonics Institute, Vienna University of Technology, Gußhausstraße 27-29, 1040 Vienna, Austria;2. Charles University, Faculty of Mathematics and Physics, Institute of Physics, Ke Karlovu 5, Prague, 121 16 Czech Republic;1. Institut für Physik, Universität Rostock, Albert-Einstein-Str. 23-24, D-18059 Rostock, Germany;2. Gas Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar;1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510631, China;3. The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072,China;1. Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan;2. Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan;3. Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;4. JST-PRESTO, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan
Abstract:The fluorescence anisotropic decay is modeled for the B850 bacteriochlorophyll a complex of the purple bacterium Rhodopseudomonas acidophila. Structural information is combined with experimental data to derive a Hamilton operator which models the S0–S1 excitation energy transfer between the pigments as well as the energy dissipation into the protein environment. The time-resolved fluorescence signal is determined from the solutions of the equations of motion for the one–exciton density matrix. Nonsecular terms in the Redfield relaxation tensor are shown to have a dramatic influence on the calculated time scales for depolarization.
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