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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