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Updated: May 5, 2026

In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae
Published on: October 10, 2014
Site inhomogeneity and exciton delocalization in the photosynthetic antenna
T V Dracheva1, V I Novoderezhkin, A P Razjivin
1A.N. Belozersky Institute of Physico-Chemical Biology, M.V. Lomonosov Moscow State University, 119899, Moscow, Russian Federation.
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.
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