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How long does excitonic motion in the photosynthetic unit remain coherent?

Authors
Journal
Journal of Theoretical Biology
0022-5193
Publisher
Elsevier
Publication Date
Volume
120
Issue
4
Identifiers
DOI: 10.1016/s0022-5193(86)80035-2

Abstract

The effect of the interactions between pigment molecules on energy transfer in the photosynthetic antenna is poorly described when taking into account only the two lowest orders of the dipole-dipole interaction. The widely accepted conclusion ( Kenkre & Knox, 1976), that excitonic motion in the photosynthetic unit (PSU) resembles an incoherent random walk is based on this approximation and we question its correctness. The properties of the excitonic motion in the PSU are analyzed using the Haken-Strobl model. Our calculations suggest that the excitonic motion in the antenna is coherent for more than 1 psec.

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