Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 21: POSTER B
CPP 21.9: Poster
Dienstag, 25. März 2003, 19:00–21:00, ZEU/250
Exciton dynamics in light harvesting systems — •Peter Reineker1, Christoph Warns1, Christoph Supritz1, and Ivan Barvik2 — 1Department of Theoretical Physics, University of Ulm, 89069 Ulm, Germany — 2Institute of Physics, Charles University, Ke Karlovu 5, 121-16 Prague, Czech Republic
We investigate the relation between the exciton transfer regime and the optical properties of ring (LH2 complex from purple bacteria photosynthetic units) and spiral (isolated chlorosomes from green bacteria Chlorobium tepidum or Chloroflexus aurantiacus) antenna systems.
We simulate the influence of the coupled coherent and incoherent excitonic energy transport on the optical line shape of the B850 ring in LH2. The influence of the slow motion of the protein scaffold and of the inner molecular vibrations is described by slow and fast independent colored dichotomic Markov processes with long and short time constants, respectively, of the decay of their correlation functions. The optical line shape of the aggregate is investigated in dependence of the parameters of the stochastic processes and on the extent of the elliptical deformation of the ring system.
Further we investigate the coupled coherent and incoherent energy transport in chlorosomes.