We calculate rates of excitation-energy transfer (EET) from B800 to B850 within the light-harvesting antenna complex LH2 of photosynthetic purple bacteria. The calculation is based on a new formula which incorporates EET interactions between transition dipoles distributed on individual chromophores in the acceptor molecular aggregate and those in the donor. The calculated rate is in good agreement with experiments, which could not be explained by directly applying Forster's theory.
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