Specific Features of the Current-Voltage Characteristics of Diffuse Glow Discharges in Ar:N-2 Mixtures

N. A. Dyatko, Yu. Z. Ionikh, A. V. Meshchanov, A. P. Napartovich, K. A. Barzilovich

Research output

16 Citations (Scopus)

Abstract

The characteristics of diffuse glow discharges in pure argon and the Ar + 1%N2 mixture at pressures of 2–80 Torr were studied experimentally and numerically. The discharge operated in a molybdenumglass tube with an inner diameter of 2.8 cm and interelectrode distance of 75 cm. The current-voltage characteristic of the discharge and the populations of the N2(B3Γ g ) and N2(C3Γ u ) states were measured. It is shown that, at relatively low pressures (P < 10 Torr), the current-voltage characteristic of a discharge in the argon-nitrogen mixture lies higher than that in pure argon. In contrast, at higher pressures (P > 15 Torr), the current-voltage characteristic of a discharge in the mixture lies lower than that in pure argon. As the pressure increases, the effect of the reduction in the discharge voltage becomes more pronounced. A self-consistent zero-dimensional kinetic model is developed that allows one to calculate the characteristics of the positive column of a discharge in pure argon and Ar:N2 mixtures under the conditions of high vibrational excitation of nitrogen. A detailed description of the model is presented, and the calculated results are compared with experimental data. The model adequately reproduces the observed change in the current-voltage characteristic in Ar and the Ar + 1%N2 mixture with increasing gas pressure. It is shown that the main ionization mechanism in the Ar + 1%N2 mixture at moderate pressures is the associative ionization of excited nitrogen atoms.
Original languageEnglish
Pages (from-to)1040-1064
Number of pages25
JournalPlasma Physics Reports
Volume36
Issue number12
DOIs
Publication statusPublished - 2010

Fingerprint Dive into the research topics of 'Specific Features of the Current-Voltage Characteristics of Diffuse Glow Discharges in Ar:N-2 Mixtures'. Together they form a unique fingerprint.

  • Cite this