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Lecture A. Eisfeld


19 November 2010 FWN-Building 513.0201, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. A. Eisfeld
Affiliation:Mac-Planck-Institut for the Physics of Complex Systems, Dresden, Germany
Title:Influence of vibrational modes on the absorption of molecular aggregates
Date:Fri Nov 19, 2010
Location:FWN-Building 513.0201
Host:M. Mostovoy
Telephone:+31 50 363 4950


In the first part of the talk I will discuss helium nanodroplet isolation (HENDI) spectroscopy of the organic semiconductor PTCDA. Experimentally, it is found that the monomer spectrum exhibits clearly separated, very sharp vibronic absorption lines. The oligomer spectrum, however, consists of three very broad peaks having an apparent width roughly three orders of magnitude larger than the width of the monomer lines. These findings are explained using a simple theoretical model for the oligomer, in which a Frenkel exciton couples to internal vibrational modes of the monomers. While in the HENDI experiments the interaction with the environment is negligible in the second part we treat also coupling to environmental modes. We present an approach, based on a stochastic Schroedinger equation, which allows to treat complex spectral densities.
Last modified:22 October 2012 2.30 p.m.