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Changes of the nitrogen 2-nd positive system due to small methane addition

S. D. POPA1, L. CIOBOTARU1,*

Affiliation

  1. National Institute for Lasers, Plasma and Radiation Physics, Atomistilor 409, PO Box MG – 36, Măgurele, România

Abstract

The influence of small quantities of methane on the behavior of the nitrogen radiative species N2(C) has been studied by emission spectroscopy in a N2 – CH4 d.c. flowing discharge. Second positive nitrogen system, especially the 0-0 transition with λ = 337.1 nm, was investigated for methane proportion varying in the range 0.00 – 0.1 %. A sensitive increase (up to 6 times) of the band intensities of the second positive system has been found when the methane concentration raised. This is explained in correlation with the increase of the E/N reduced electric field, due to a lower ionization threshold in a N2 – CH4 mixture..

Keywords

Flowing discharge, N2 – CH4 mixtures, Nitrogen second positive system, Emission spectroscopy.

Submitted at: Jan. 29, 2007
Accepted at: Sept. 18, 2007

Citation

S. D. POPA, L. CIOBOTARU, Changes of the nitrogen 2-nd positive system due to small methane addition, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 9, pp. 2935-2936 (2007)