Eur. Phys. J. Appl. Phys.
Volume 26, Number 1, April 2004
|Page(s)||59 - 64|
|Section||Plasma, Discharges and Processes|
|Published online||04 March 2004|
A detailed discussion of the N2(C 3Πu) and N2(X 1Σg+) vibrational temperatures in N2 glow discharges
Laboratório Interdisciplinar de Materials (LABMAT), Universidade Federal de Santa Catarina, 88040-900, Florianópolis, Brazil
2 Centre de Physique des Plasmas et leurs Applications (CPAT), Université Paul Sabatier, 31062 Toulouse Cedex, France
3 Departamento de Física, Instituto Tecnológico de Aeronáutica, Centro Técnico Aeroespacial, 12228-900, São José dos Campos, Brazil
Corresponding author: email@example.com
Revised: 10 December 2003
Accepted: 16 January 2004
Published online: 4 March 2004
A N2 direct current discharge was studied by optical emission spectroscopy. Experimental parameters as gas flow rate (Q), pressure (p) and current (I) were varied independently, covering the following range: 10 < I < 75 mA, 100 < Q < 1000 sccm and 1.7 < p < 10 torr, corresponding to the following plasma parameters: electron density in the range 109−1012 cm−3 and reduced electric field between 3×10−16 and 10−15 V cm−2. The N2(C ), N2(X ) vibrational temperatures and the gas temperature were obtained from the first and second positive systems emissions. The N2(C ) vibrational distributions did not exhibit a Boltzmann character. A linearization process was employed to such distributions allowing us to calculate the N2(C ) temperature. The N2(X ) temperature was calculated from the N2(C ) one on the basis of the Franck-Condon factors. Results and the method of vibrational temperature calculus are presented.
PACS: 52.70.Kz – Optical (ultraviolet, visible, infrared) measurements
© EDP Sciences, 2004
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