Berlin 2001 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 17: Poster: Spectroscopy and Single Particle Spectroscopy of Molecular Systems, Photoprocesses, Biological Systems
CPP 17.17: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT1
Exciton scattering in light-harvesting systems of purple bacteria — •U. Kleinekathöfer1, P. Heřman2, I. Barvik3, and M. Schreiber1 — 1Institut für Physik, Technische Universität, D-09107 Chemnitz — 2Dept. of Physics, University of Education, Hradec Králové, Czech Republic — 3Faculty of Mathematics and Physics, Institue of Physics of Charles University, Prague, Czech Republic
Using the reduced density matrix formalism the exciton scattering in light-harvesting systems of purple bacteria is calculated. In contrast to the work of Kumble and Hochstrasser [1] we took the static disorder (fluctuations of the site energies) as well as the dynamic disorder (dissipation) into account in this work. Circular aggregates with 18 pigments are studied to model the B850 ring of bacteriochlorophylls with LH2 complexes. It can be shown that the influence of dissipation may not be neglected in the simulation of the time-dependent anisotropy of the fluorescence. Smaller values of the site energy fluctuations are needed to reproduce the experimental signals in comparison with the results by Kumble and Hochstrasser [1].
[1] R. Kumble and R. M. Hochstrasser, J. Chem. Phys. 109, 855 (1998).