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P: Fachverband Plasmaphysik

P 12: Atmospheric Pressure Plasmas I

P 12.5: Vortrag

Mittwoch, 18. März 2026, 15:00–15:15, KH 01.020

Determination of the argon 3p⁵4s population distribution in a single-filament dielectric barrier discharge at atmospheric pressure — •Levin Krös^1,2, Hans Höft¹, Marjan Stankov¹, Detlef Loffhagen¹, Jean-Pierre H. van Helden³, and Ronny Brandenburg^1,2 — ¹Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany — ²Institute of Physics, University of Rostock, Rostock, Germany — ³Faculty of Physics and Astronomy, Ruhr University Bochum, Bochum, Germany

Atoms and molecules in excited states impact the discharge and chemical reaction kinetics by their contribution to the production of charge carriers, via, e.g., step-wise ionisation or chemi-ionisation processes. In argon discharges, these processes are mainly driven by the energetically lowest excited states in the 3p⁵4s group, namely in Paschen notation, the two resonance states 1s₂ and 1s₄ and the two metastable states 1s₃ and 1s₅. Measurements of number densities of all four 3p⁵4s states allow to determine the population distribution, which is valuable for benchmarking the kinetics of numerical models. We report spatio-temporally resolved number densities of those states measured in a single-filament dielectric barrier discharge operated with a sinusoidal high-voltage waveform at atmospheric pressure using tunable diode laser absorption spectroscopy. The population distribution will be compared with results of a time-dependent, spatially one-dimensional fluid model.

This work is funded by the DFG (project number: 504701852).

Keywords: Absorption spectroscopy; Single-filament dielectric barrier discharge; Atmospheric pressure; Population distribution; Fluid modelling