Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 21: Atmospheric Pressure Plasmas II

P 21.2: Talk

Friday, April 1, 2022, 14:15–14:30, P-H11

Vibrational excitation in a CO₂/N₂ ns-discharge — Yanjun Du^1,2, •Tsanko V. Tsankov¹, Dirk Luggenhölscher¹, and Uwe Czarnetzki¹ — ¹Institute for Plasma and Atomic Physics, Ruhr University Bochum, D-44780 Bochum, Germany — ²North China Electric Power University, Beijing, China

Repetitively pulsed ns-discharges exhibit large departure from equilibrium. This is especially well suited for studying the excitation of molecules due to the separation of the time scales for population and relaxation. Of particular interest in recent years is the study of discharges in CO₂ in relation to efficient molecule dissociation through ladder climbing excitation of the vibrational states [1]. A tunable quantum cascade laser system for absorption measurements has been set up to measure this excitation with ns resolution [1,2].

Here the system is employed to obtain the excitation dynamics of the CO₂ states in a ns pulsed discharge in a near-atmospheric pressure CO₂/N₂ mixture. The mechanisms for CO₂ molecular excitation during the discharge pulse and in the subsequent afterglow are discussed and compared to the ones in discharges in CO₂/He mixtures.

[1] Y. Du, Ts. V. Tsankov, D. Luggenhölscher, U. Czarnetzki, J. Phys. D: Appl. Phys. 54 (2021) 365201.

[2] Y. Du, Ts. V. Tsankov, D. Luggenhölscher, U. Czarnetzki, J. Phys. D: Appl. Phys. 54 (2021) 34LT02.