Abstract
The rate of excitation-energy transfer (EET) within the light-harvesting complex LH2 of photosynthetic purple bacteria is calculated, based on a new formula for EET between molecular aggregates with a small mutual distance, by taking into account both the exciton–phonon and exciton–disorder interactions. It is elucidated that EET from B800 to higher and optically forbidden exciton states in B850 is the dominant mechanism of the rapid EET.
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