Spectral dependence of energy transfer in wild-type peripheral light-harvesting complexes of photosynthetic bacteria |
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Authors: | Andrew Gall Egidijus Sogaila Oana Ilioaia Leonas Valkunas |
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Affiliation: | a CEA, Institut de Biologie et Technologie de Saclay, et CNRS, 91191 Gif-sur-Yvette cedex, France b Institute of Physics, Savanoriu 231, LT-02300 Vilnius, Lithuania c Department of Theoretical Physics, Vilnius University, Sauletekio 9, LT-10222 Vilnius, Lithuania |
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Abstract: | The precise position of the upper exciton component and relevant vibronic transitions of the B850 ring in peripheral light-harvesting complexes from purple photosynthetic bacteria are important values for determining the exciton bandwidth and electronic structure of the B850 ring. To determine the presence of these components in wild-type LH2 complexes the pump-probe femtosecond transient spectra obtained with excitation into the 730-840 nm spectral range are analyzed. We show that at excitation wavelengths less than 780 nm B850 absorption bands are present and that, in accordance with exciton theory, these bands peak further in the blue when the lowest optically allowed transition is more red-shifted. |
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Keywords: | BChl, bacteriochlorophyll EET, excitation energy transfer LDAO, N,N-dimethyldodecylamine-N-oxide LH1, core light-harvesting complex LH2, peripheral light-harvesting complex Rbl., Rhodoblastus Rba., Rhodobacter RC, photochemical reaction centre |
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