Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Posters 1: Ultrafast Spectroscopy

MO 13.3: Poster

Tuesday, March 6, 2018, 16:15–18:15, Orangerie

Broadband rapid-scan coherent 2D fluorescence spectroscopy — Stefan Müller, •Simon Draeger, Xiaonan Ma, Matthias Hensen, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg

We developed an all-collinear setup for 2D electronic spectroscopy using fluorescence as an observable. The supercontinuum output of an argon-filled hollow-core fiber is used for broadband excitation in the visible spectral range. The pulse trains are generated and varied by an acousto-optic dispersive filter on a 1 kHz shot-to-shot basis, thus enabling rapid data acquisition. We show that it is possible to obtain 2D spectra within a few seconds, containing various nonlinear contributions such as photon echo and two-quantum coherences. Furthermore, we provide a detailed description of the underlying Liouville pathways that give rise to those nonlinear contributions, and show how to extract them experimentally with three- and four-pulse sequences via phase cycling.