Kinetic study of CO<SUB>2</SUB> plasmas under non-equilibrium conditions. II. Input of vibrational energy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Plasma Sources Science and Technology Année : 2018

Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy

Marija Grofulovic
  • Fonction : Auteur
Tiago Silva
  • Fonction : Auteur
Bart Klarenaar
  • Fonction : Auteur
Ana-Sofia Morillo-Candas
  • Fonction : Auteur
Olivier Guaitella
Richard Engeln
  • Fonction : Auteur
C.D. Pintassilgo
  • Fonction : Auteur
V. Guerra
  • Fonction : Auteur

Résumé

This is the second of two papers presenting the study of vibrational energy exchanges in non-equilibrium CO2 plasmas in low-excitation conditions. The companion paper addresses a theoretical and experimental investigation of the time relaxation of ~70 individual vibrational levels of ground-state CO2(X1Σ ) molecules during the afterglow of a pulsed DC glow discharge, operating at pressures of a few Torr and discharge currents around 50 mA, where the rate coefficients for vibration-translation (V-T) and vibration-vibration (V-V) energy transfers among these levels are validated. Herein the investigation focus the active discharge, by extending the model with the inclusion of electron impact processes for vibrational excitation and de-excitation (e-V). The time-dependent calculated densities of the different vibrational levels are compared with experimental data obtained from time-resolved in situ Fourier Transform Infrared spectroscopy. It is shown that the vibrational temperature of the asymmetric stretching mode is always larger than the vibrational temperatures of the bending and symmetric stretching modes along the discharge pulse, the latter two remaining very nearly the same and close to the gas temperature. The general good agreement between the model predictions and the experimental results validates the e-V rate coefficients used and gives confidence that the proposed kinetic scheme provides a solid basis to understand the vibrational energy exchanges occurring in CO2 plasmas.
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Dates et versions

hal-02271983 , version 1 (27-08-2019)

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Citer

Marija Grofulovic, Tiago Silva, Bart Klarenaar, Ana-Sofia Morillo-Candas, Olivier Guaitella, et al.. Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy. Plasma Sources Science and Technology, 2018, ⟨10.1088/1361-6595/aadb60⟩. ⟨hal-02271983⟩
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