Communication science et technologie
Volume 2, Numéro 1, Pages 31-37
2003-12-01
The Influence Of The Metastable State A In The Excitation Mechanism Of Molecular Nitrogen For Non Equilibrium Plasma.case Of Low Currentarc In Extinction.
Authors : M. Tioursi . M. Messaad . G. Hartmann . R. Haug .
Abstract
In this paper,the influence of the metastable state A of n on the excitation mechanism is experimentally and theoretically solves.Exprimental part is based on study of the emitted light from the cathodic region during the spontaneous extinction of a low current electric arc.Atheoretical approach is proposed on the basis of Frank-condon factors calculations.Electron impact cross sections for transitions A and are unknown.Taking into account a partial excitation starting from the metastable state A ,the use of the Franck-Condon factors enables us to compute spectra of the second positive system(2s+)from transition C and the first negative system (1s-)from transition B of nitrogen N 2.The calculated spectrum is in agreement with an experimental one.
Keywords
Electrical arc,Plasma,Metastable state,Molecular nitrogen,Spectroscopy.
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