Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 8: Atmospheric Plasmas and their Applications III

P 8.5: Vortrag

Dienstag, 1. April 2025, 15:15–15:30, ZHG006

Nanosecond resolved vibrational kinetics of CO₂ in CO₂/N₂ mixtures: experiment and model — •Christian Alexander Busch¹, Tiago Silva², Vasco Guerra², Nikita Lepikhin¹, Inna Orel¹, Jan Kuhfeld¹, Dirk Luggenhölscher¹, and Uwe Czarnetzki¹ — ¹Ruhr University Bochum, Institute for Plasma and Atomic Physics, Bochum, Germany — ²Instituto Superior Técnico, Institute for Plasmas and Nuclear Fusion, Portugal

In this work, the vibrational kinetics of CO₂ in a ns-pulsed near-atmospheric pressure plasma jet operated in a CO₂/N₂ mixture is studied experimentally [1] and by modeling using the LisbOn KInetics codes (LoKI). This discharge allows for a temporal separation and thus an independent study of the excitation during the discharge pulse and the V-V and V-T transfer in the afterglow. The densities of individual rovibrationally excited states of CO₂ are measured with ns resolution by absorption spectroscopy using a quantum-cascade laser.
Notably, a short-lived non-equilibrium was observed between the populations of the Fermi resonant states and the bending mode. Additionally, the excitation of the asymmetric stretch mode was found to deviate from a commonly applied scaling law.
The work was supported by the DFG funded SFB1316 project *Transient atmospheric plasmas - from plasmas to liquids to solids*. IPFN activities were supported by FCT - Fundação para a Ciência e Tecnologia under projects UIDB/50010/2020, UIDP/50010/2020, LA/P/0061/202 and PTDC/FIS-PLA/1616/2021.
[1] Christian A Busch et al 2025 J. Phys. D: Appl. Phys. 58 065202

Keywords: vibrational kinetics; nanosecond pulsed discharge; absorption spectroscopy; modeling; CO2