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Open AccessArticle

Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High–Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms

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Grupo de Descargas Eléctricas, Departamento Ing. Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, Venado Tuerto, 2600 Santa Fe, Argentina
2
CONICET, Facultad Regional Venado Tuerto Departamento Ing. Electromecánica, Grupo de Descargas Eléctricas, Universidad Tecnológica Nacional, Laprida 651, Venado Tuerto, 2600 Santa Fe, Argentina
*
Author to whom correspondence should be addressed.
Plasma 2020, 3(1), 12-26; https://doi.org/10.3390/plasma3010003
Received: 17 December 2019 / Revised: 17 January 2020 / Accepted: 21 January 2020 / Published: 18 February 2020
A model of a stationary glow-type discharge in atmospheric-pressure air operated in high-gas-temperature regimes (1000 K < Tg < 6000 K), with a focus on the role of associative ionization reactions involving N(2D,2P)-excited atoms, is developed. Thermal dissociation of vibrationally excited nitrogen molecules, as well as electronic excitation from all the vibrational levels of the nitrogen molecules, is also accounted for. The calculations show that the near-threshold associative ionization reaction, N(2D) + O(3P) → NO+ + e, is the major ionization mechanism in air at 2500 K < Tg < 4500 K while the ionization of NO molecules by electron impact is the dominant mechanism at lower gas temperatures and the high-threshold associative ionization reaction involving ground-state atoms dominates at higher temperatures. The exoergic associative ionization reaction, N(2P) + O(3P) → NO+ + e, also speeds up the ionization at the highest temperature values. The vibrational excitation of the gas significantly accelerates the production of N2(A3u+) molecules, which in turn increases the densities of excited N(2D,2P) atoms. Because the electron energy required for the excitation of the N2(A3u+) state from N2(X1g+, v) molecules (e.g., 6.2 eV for v = 0) is considerably lower than the ionization energy (9.27 eV) of the NO molecules, the reduced electric field begins to noticeably fall at Tg > 2500 K. The calculated plasma parameters agree with the available experimental data. View Full-Text
Keywords: glow discharge; air; ionization kinetics glow discharge; air; ionization kinetics
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Cejas, E.; Mancinelli, B.; Prevosto, L. Modelling of an Atmospheric–Pressure Air Glow Discharge Operating in High–Gas Temperature Regimes: The Role of the Associative Ionization Reactions Involving Excited Atoms. Plasma 2020, 3, 12-26.

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