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Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Atmospheric-pressure plasma and applications 2

P 7.5: Vortrag

Dienstag, 10. März 2020, 12:15–12:30, b305

Laser-induced fluorescence of magnetized plasma with magnetic sub-level resolution — •Roman Bergert, Slobodan Mitic, and Markus H. Thoma — I. Physikalisches Institut, Justus-Liebig Universität Gießen

The behaviour of a dielectric barrier discharge (DBD) jet influenced by an external constant magnetic field (0.3 T) at different pressures was investigated by tunable diode laser absorption spectroscopy (TDLAS) and laser-induced fluorescence (LIF) in perpendicular observation to the magnetic field. TDLAS and LIF were done with magnetic sub-level resolution on π (linear) and σ (circular) polarized transitions of Argon 1s4 at 842.47 nm and 1s5 at 801.48 nm. Unpolarized laser light was used for the measurements. For LIF the 842 nm transitions were used for pumping.
The 1s4 magnetic sub-level densities were reconstructed from linear polarized transitions for different pressures. The densities were later used for modeling of the magnetic sub-level and polarization resolved fluorescence of 842 nm and 801 nm for different pressures. ’Forbidden’ transitions were observed and could be explained with a model including level mixing of the 2p8 sub-level states through neutral collisions. A strong visible pressure dependence of LIF and the development of the ’forbidden’ transition could be observed and modeled successfully.

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