Regensburg 2002 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 16: Polymere Netzwerke und Polymere mit besonderer Architektur

CPP 16.2: Vortrag

Donnerstag, 14. März 2002, 09:40–10:00, H38

Energy transport and optical absorption of dendrimers — •Peter Reineker1, Andreas Engelmann1, and Vladimir Yudson21Abteilung Theoretische Physik, Universität Ulm, 89069 Ulm, Germany — 2Center for Frontier Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

Dendrimers are of increasing experimental and theoretical interest because of various open questions in fundamental research and a broad range of potential applications in biology, chemistry and physics. We model the hyperbranched molecule by an ensemble of two-level systems with different excitation energies in each generation of the dendrimer. The molecules are interacting with each other via transfer integrals modelling the specific spacial structure of the dendrimers. The influence of the phonons is taken into account by allowing for fluctuations of the local excitation energies and of the transfer matrix elements. We calculate the optical absorption line shape for dendrimers of various sizes and discuss the spatial distribution of the excitation energy as a function of the dendrimer size. Furthermore, the time dependence of the coupled coherent and incoherent energy transport is discussed for several initial energy distributions.

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