München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.43: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Ro-vibrational distribution measurements in transient atmospheric pressure plasmas by coherent anti-Stokes Raman scattering — •Jan Kuhfeld, Dirk Luggenhölscher, and Uwe Czarnetzki — Ruhr University Bochum, Faculty of Physics and Astronomy, Experimental Physics V, Germany

Ro-vibrational excited molecules govern the plasma wall interaction and the chemical reactions in atmospheric pressure plasmas. Excitation of a molecule can occur by an energetic electron or by collisional transfer from an already excited molecule. One of the key goals in discharge design is optimizing these excitation processes in order to achieve maximum energy efficiency in chemical conversion, e.g. CO₂ into CO. The experimental approach for investigating these processes introduced here is based on a particular coherent anti-Stokes Raman scattering (CARS) scheme. This single shot dual pump CARS scheme provides in parallel information on the ro-vibrational population of two molecular species, here N₂ and CO₂. Excited molecules are created by two separated ns-pulsed APPJ with effluents intercepting. Space and time resolutions are determined by the interaction volume of the lasers and the pulse length respectively. Those are in the order of 10 µm and 10 ns.