Freiburg 2024 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: Poster: Spectroscopy

MO 7.11: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent C

Simplified photoelectron photoion covariance spectrometer for challenging UV pump-probe experiments — •Nicolas Ladda, Fabian Westmeier, Tonio Rosen, Sudheendran Vasudevan, Hangyeol Lee, Simon Ranecky, Sagnik Das, Jayanta Ghosh, Till Stehling, Hendrike Braun, Jochen Mikosch, Thomas Baumert, and Arne Senftleben — Institut für Physik, Universität Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany

Velocity Map Imaging spectroscopy is a powerful method for investigating photoionization processes. The technique can be combined with time-of-flight spectrometry to gain further insight into the underlying processes. The resulting device can be used for photoelectron photoion covariance (PEPICO) measurements. Here we want to present our simple, but geometrically optimized PEPICO spectrometer, which can measure photoelectron momenta and photoion masses with high resolution while minimizing the background signal originating from scattered UV photons. The spectrometer will be used to investigate the dynamics of chiral molecules by studying time-resolved photoelectron circular dichroism [1]. In addition to special viewports made of single-crystal calcium fluoride (CaF2) with a broadband AR coating (190 - 900 nm) to minimize reflections and scattering, baffles made of dendritic copper oxide (δ-CuO) with high UV absorption are used to capture the residual scattered photons [2].

[1] Lux, C. et al. Angew. Chem. Int. Ed. 51, 5001*5005 (2012)

[2] Clarkin, O. J., Dissertation, Queen's University, (2012)