Mainz 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MO: Fachverband Molekülphysik
MO 13: Poster – Ultrafast Electronic Dynamics
MO 13.4: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG
Influence of Polymer Structure on Multi-Exciton Interactions in Different Squaraine Polymers — •Karina Heilmeier1, Emely Freytag2, Kateřina Charvátová3, Federico Gallina4, Stefan Mueller1, Jacob J. Krich4,5, Christoph Lambert2, Pavel Malý3, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 4Department of Physics, University of Ottawa, Ottawa, Ontario, Canada — 5Nexus for Quantum Technologies, University of Ottawa, Ottawa, Ontario, Canada
Higher-order nonlinear signals in ultrafast spectroscopy provide unique information on the interactions of multiple excitons and their dynamics. Recently, we demonstrated how such signals can be extracted using intensity cycling in higher-order transient absorption (TA) measurements [1]. Here, we employ higher-order TA and fluorescence-detected two-dimensional spectroscopy to investigate multi-exciton interactions in two structurally different squaraine polymers built up of the same monomer but with different connectivity. This direct comparison allows us to reveal how the different polymer structures influence the exciton relaxation, transport and exciton–exciton annihilation dynamics.
[1] P. Malý, J. Lüttig, P. A. Rose, A. Turkin, C. Lambert, J. J. Krich, T. Brixner, Nature 616, 280 (2023).
Keywords: Higher-Order Pump--Probe Spectroscopy; Two-Dimensional Fluorescence-Detected Spectroscopy; Multi-Exciton Interaction; Squaraine Polymer; Polymer Structures