Münster 1999 – wissenschaftliches Programm
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CP: Chemische Physik
CP 7: Spektroskopie
CP 7.6: Vortrag
Montag, 22. März 1999, 15:15–15:30, Gg
Excitonic line shape of cyclic molecular aggregates: Influence of quasistatic and dynamic disorder — •P. Reineker1, I. Barvik1,2, Ch. Warns1, and Th. Neidlinger1 — 1Abteilung Theoretische Physik, Universit"at Ulm, 89069 Ulm — 2Institute of Physics, Charles University, Ke Karlovu 5, 121-16 Prague, Czech Republic
For Frenkel excitons moving on molecular rings modeling in part bacteria photosynthetic antenna systems we investigate the influence of dynamic and static disorder on their optical lineshape. The dynamic disorder, describing the influence of vibrational degrees of freedom and static disorder are taken into account by fluctuations of the local excitation energies of the BChl molecules. The fluctuations are represented by dichotomic Markov processes with colored noise with different amplitudes and decay constants of the correlation functions. We obtain a closed set of equations of motion for the correlation functions determining the optical lineshape which is solved numerically. The optical lineshapes of circular aggregates with 9 and 18 BChls are discussed for various sets of the model parameters describing static and dynamic disorders.