Exciton scattering in light-harvesting systems of purple bacteria

Using the reduced density matrix formalism the exciton scattering in light-harvesting systems of purple bacteria is calculated. Static disorder (fluctuations of the site energies) as well as dynamic disorder (dissipation) is taken into account in this work. Circular aggregates within 18 pigments are studied to model the B850 ring of bacteriochlorophylls within LH2 complexes. 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.