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MO: Molekülphysik
MO 72: Collisions and Energy Transfer
MO 72.7: Talk
Friday, March 17, 2006, 12:10–12:25, H10
Dispersive Delocaization Length on J-Aggregates from Nonlinear Absorption — •Christian Spitz1, Herbert Legall2, Holger Stiel2, and Ralf Menzel1 — 1Universität Potsdam — 2MBI-Berlin
Excitons in two-dimensional molecular aggregates of TDBC were investigated by nonlinear absorption and pump-probe spectroscopy in ps resolution. It is shown how the delocalization length of the optical excitation can be determined by these measurements.
The main result obtained by this experiments is a dispersive delocalization length of the excitons. This can be interpreted, within exciton theory, as excitation of levels with equal eigenvalues but with different degree of delocalization, and therefore different energies. This assumption was proofed by modeling the absorption spectrum, based on dispersive coherence length, which fits well to the experimental results.