Exciton transfer in disordered molecular aggregates: Computer modeling of optical line shapes in ring bacteria antenna systems

The structure of the LH2 subunit Rps. acidophila consists of a ring of 9 αβ heterodimers with 18 B850 BChl molecules sandwiched between the α and β subunits. For Frenkel excitons moving on the ring we investigate the influence of dynamic and static disorder on their optical line shapes. The dynamic...

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Bibliographic Details
Published in:Journal of luminescence 1998-02, Vol.76, p.331-334
Main Authors: Barvík, I., Warns, Ch, Reineker, P.
Format: Article
Language:English
Subjects:
Antenna systems
Biological and medical sciences
Coherent transfer
Computer simulation
Electron transitions
Energy transfer
Excitons
Fundamental and applied biological sciences. Psychology
Markov processes
Molecular biophysics
Molecular structure
Optical line shapes
Photochemistry. Photosynthesis. Bioluminescence
Photosynthesis
Radiation-biomolecule interaction
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Summary:The structure of the LH2 subunit Rps. acidophila consists of a ring of 9 αβ heterodimers with 18 B850 BChl molecules sandwiched between the α and β subunits. For Frenkel excitons moving on the ring we investigate the influence of dynamic and static disorder on their optical line shapes. The dynamic and static disorders are taken into account by fluctuations of the local energies of the BChl molecules. The fluctuations are represented by dichotomic Markov processes with coloured noise. Comparison of our theoretical results with experimental observations indicates, that the strength of the local energy fluctuation Δ should be smaller than J 2 .
ISSN:0022-2313
1872-7883
DOI:10.1016/S0022-2313(97)00220-2