TCB Publications - Abstract

Melih K. Sener, Sanghyun Park, Deyu Lu, Ana Damjanović, Thorsten Ritz, Petra Fromme, and Klaus Schulten. Excitation migration in trimeric cyanobacterial photosystem I. Journal of Chemical Physics, 120:11183-11195, 2004.

SENE2004 A structure-based description of excitation migration in multi-reaction center light harvesting systems is introduced. The description is an extension of the sojourn expansion, which decomposes excitation migration in terms of repeated detrapping and recapture events. The approach is applied to light harvesting in the trimeric form of cyanobacterial photosystem I (PSI). Excitation is found to be shared between PSI monomers and the chlorophylls providing the strongest respective links are identified. Excitation sharing is investigated by computing cross-monomer excitation trapping probabilities. It is seen that on the average there is a nearly 40% chance of excitation cross-transfer and trapping, indicating efficient coupling between monomers. The robustness and optimality of the chlorophyll network of trimeric PSI is examined.

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