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Title
Japanese: 
English:Impact of Air Impurity Quenching on the Determination of Electron Temperature and Density in Atmospheric-Pressure Helium Plasma Jets 
Author
Japanese: 榎本純, 菊地航行, 田口智也, 林珂任, 根津篤, 赤塚洋.  
English: Jun ENOMOTO, Wataru KIKUCHI, Tomoya TAGUCHI, Keren LIN, Atsushi NEZU, Hiroshi AKATSUKA.  
Language English 
Journal/Book name
Japanese: 
English:Proc. the 31st Symposium on Plasma Physics and Technology 
Volume, Number, Page        
Published date June 15, 2026 
Publisher
Japanese: 
English:INSTITUTE OF PLASMA PHYSICS ACADEMY OF SCIENCES CR, PRAGUE 
Conference name
Japanese: 
English:The 31st Symposium on Plasma Physics and Technology (31SPPT) 
Conference site
Japanese:プラハ 
English:Prague 
Official URL https://www.plasmaconference.cz/about.php
 
Abstract This study investigates electron temperature (T_e) and density (n_e) in atmospheric-pressure plasma jets by considering quenching between metastable helium and nitrogen/oxygen molecules in the air. Optical emission spectroscopy was performed in the plasma plume region. Based on the framework by Lin et al. (2023), the collisional-radiative model was extended to include Penning ionization. Parameters (Te, ne, metastable densities, and He/air ratio) were optimized via grid search by minimizing the discrepancy between measured and calculated population densities of helium excited states. The He+Air model yielded Te = 1.21 eV and ne = 3.9 × 10^{11} cm-3. In contrast, the Pure He model gave an unrealistic 0.23 eV. Metastable densities dropped by ~6 orders of magnitude in the He+Air model due to quenching. Although the He+Air model had a higher fitting error, its results are physically consistent with active streamer discharges. The He+Air model provides the physically correct solution.

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