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MO: Fachverband Molekülphysik

MO 4: Femtosecond Spectroscopy I

MO 4.2: Talk

Monday, March 14, 2011, 14:45–15:00, TOE 317

Theoretical investigations on 2D electronic spectra of a π-aggregated dimer upon intermolecular torsional motion — •Joachim Seibt and Alexander Eisfeld — MPI for the Physics of Complex Systems, Nöthnitzer Straße 38, Dresden

The influence of relaxation and dephasing effects on two-dimensional electronic spectra of a π-aggregated dimer is investigated, where an intermolecular torsional degree of freedom is taken into account on the basis of a simple model system. While absorption from the ground state mainly populates the upper 1-exciton state, the system can pass a conical intersection upon nuclear motion during a sufficiently large relaxation time, which results in subsequent dynamics at the lower singly excited state potential. In this context, characteristic changes in the 2D-spectrum are discussed with specific attention to the role of the relevant excitation pathways.