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We investigate the influence of relaxation and dissipation effects on two-dimensional electronic spectra of a π-aggregated dimer, where the employed model system contains an intermolecular torsional degree of freedom. Even though absorption from the ground state mainly populates the upper 1-exciton state, the system is affected by dissipation, which results in subsequent dynamics at the lower singly excited state potential. During a sufficiently large relaxation time, the respective transfer processes either arise in passing a conical intersection upon nuclear motion or stem from interactions with the surrounding bath. In this context, characteristic changes in the 2D-spectrum are discussed with specific attention to the signatures of torsional dynamics and relaxation effects. |