Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

doi:10.1088/1674-1056/25/1/015204

Abstract The dominant process in relaxation of DC glow discharge between two plane parallel electrodes in argon at pressure 200 Pa is analyzed by measuring the breakdown time delay and by analytical and numerical models. By using the approximate analytical model it is found that the relaxation in a range from 20 to 60 ms in afterglow is dominated by Ar₂⁺ ions, produced by atomic-to-molecular conversion of Ar⁺ ions in the first several milliseconds after the cessation of the discharge. This conversion is confirmed by the presence of double-Gaussian distribution for the formative time delay, as well as conversion maxima in a set of memory curves measured in different conditions. Finally, the numerical one-dimensional (1D) model for determining the number densities of dominant particles in stationary DC glow discharge and two-dimensional (2D) model for the relaxation are used to confirm the previous assumptions and to determine the corresponding collision and transport coefficients of dominant species and processes.

Keywords: argon discharge afterglow relaxation fluid model plasma reactions

Received: 20 May 2015
Revised: 10 September 2015
Accepted manuscript online:

PACS:	52.80.-s	(Electric discharges)
	52.20.-j	(Elementary processes in plasmas)
	52.65.Kj	(Magnetohydrodynamic and fluid equation)
	82.33.Xj	(Plasma reactions (including flowing afterglow and electric discharges))

Fund: Project supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. ON171025).

Corresponding Authors: M N Stankov
E-mail: marjansstankov@gmail.com

Cite this article:

M N Stankov, A P Jovanović, V Lj Marković, S N Stamenković Conversion of an atomic to a molecular argon ion and low pressure argon relaxation 2016 Chin. Phys. B 25 015204

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Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

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