Photochemical hole-burning in photosynthetic reaction centers |
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| Institution: | 1. Department of Biology, Washington University, St. Louis, MO 63130, USA;2. Center for Solar Energy and Energy Storage, Washington University, St. Louis, MO 63130, USA;3. Department of Energy, Environmental & Chemical Engineering, Washington University, St. Louis, MO 63130, USA;1. A. N. Belozersky Institute of Physical-Chemical Biology, Lomonosov Moscow State University, Leninskye Gory 1 Building 40, 119992 Moscow, Russia;2. Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche, Via Bassini 15a, 20133 Milano, Italy;3. N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Kosygina Street 1, 119991 Moscow, Russia;4. Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991 Moscow, Russia;5. Photosynthesis Research Unit, Centro Studi sulla Biologia Cellulare e Molecolare delle Piante, Consiglio Nazionale delle Ricerche, Via Celoria 26, 20133 Milano, Italy |
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| Abstract: | The change in absorbance (hole spectrum) of the primary electron donor (P870) in bacterial photosynthetic reaction centers has been studied at 1.5–2.1 K following narrow-band excitation at several wavelengths within the P870 absorption band. The hole width is very large, suggesting a homogeneous linewidth on the order of 200–300 cm−1. Possible interpretations of this highly unusual result, including ultra-fast excited-state decay, are discussed. |
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