Regensburg 2002 – scientific programme
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SYBM: Physik biologischer Materie
SYBM 401: Physics of biological matter: Poster
SYBM 401.39: Poster
Tuesday, March 12, 2002, 18:00–19:30, H37
Fluorescence depolarization in light-harvesting systems of purple bacteria — •U. Kleinekathöfer1,2, P. Heřman3, I. Barvik4, I. Kondov1, and M. Schreiber1,2 — 1Institut für Physik, Technische Universität, D-09107 Chemnitz — 2International University Bremen, D-28725 Bremen, Germany — 3Dept. of Physics, University of Hradec Králové, Czech Republic — 4Institute 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. The static disorder (fluctuations of the site energies) as well as the dynamic disorder (dissipation) is taken into account in this work. Circular aggregates with 18 pigments are studied to model the B850 ring of bacteriochlorophylls. It can be shown that the influence of dissipation may not be neglected in the simulation of the time-dependent anisotropy of fluorescence. Also an elliptical deformation of the ring could be essential. The effects of non-Markovian memory effects on the short-time dynamics are investigated.
[1] P. Heřman, U. Kleinekathöfer, I. Barvìk, and M. Schreiber, Chem. Phys. (in press).
[2] P. Heřman, U. Kleinekathöfer, I. Barvìk, and M. Schreiber, J. Lumin. 94-95, 447 (2001).