Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.58: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Optical Absorption in Dendrimers — •Christoph Supritz, Andreas Engelmann, and Peter Reineker — University of Ulm, Department of Theoretical Physics, 89069 Ulm

Dendrimers are highly branched molecules which are expected to be useful for example as efficient artificial light harvesting systems in nano-technological applications.

There are two different classes of dendrimers: compact dendrimers with constant distance between neighbouring branching points throughout the macromolecule, and extended dendrimers where this distance increases from the system periphery to the center. We investigate the linear absorption spectra of these dendrimer types and the transport of excitation energy inside them using the Frenkel exciton concept.

To take into account the electron phonon interaction we introduce a heat bath that interacts with the excitons in a stochastic manner. In addition, for the energy transport we assume the dendrimer core to be connected to a randomly modulated decay channel (trap).