Site inhomogeneity and exciton delocalization in the photosynthetic antenna |
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| Authors: | Tatiana V Dracheva Vladimir I Novoderezhkin Andrei P Razjivin |
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| Institution: | (1) A.N. Belozersky Institute of Physico-Chemical Biology, M.V. Lomonosov Moscow State University, 119899 Moscow, Russian Federation;(2) Scientific Research Center on Technological Lasers, Russian Academy of Science, 142092 Troizk, Moscow Region, Russian Federation |
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| Abstract: | The influence of energy disorder on exciton states of molecular aggregates (the dimer and the circular aggregate) was analyzed. The dipole strength and inhomogeneous line shapes of exciton states were calculated by means of numerical diagonalization of Hamiltonian with diagonal energy disorder without intersite correlation. The disorder degree corresponding to destruction of coherent exciton states was estimated. The circular aggregates were treated as a model of light-harvesting antenna structures of photosynthetic bacteria. It was concluded that the site inhomogeneity typical for LH1 and LH2 complexes of purple bacteria cannot significantly influence the exciton delocalization over the whole antenna.Abbreviations BChl-
bacteriochlorophyll
- LH1 and LH2-
 core and peripheral light-harvesting complexes from purple bacteria
- RC-
reaction center |
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| Keywords: | exciton light-harvesting antenna primary processes bacterial photosynthesis site inhomogeneity |
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