Eur. Phys. J. Appl. Phys.
Volume 38, Number 2, May 2007
|Page(s)||153 - 159|
|Section||Plasma, Discharge and Processes|
|Published online||21 March 2007|
Optical study of OH radical in a needle-plate DC corona discharge
State Key Laboratory of Materials Modification by Laser, Ion and Electron
Beams, Dalian University of Technology, Dalian, 116024, P.R. China
Corresponding author: email@example.com
Revised: 6 July 2006
Accepted: 7 February 2007
Published online: 21 March 2007
In this study, the emission spectra of OH (A2Σ → X2Π, 0-0) and N2 (C3Πu → B3Πg) emitted from the high-voltage DC (direct-current) corona discharge of N2 and H2O mixture gas in a needle-plate reactor are successfully recorded at one atmosphere. The relative vibrational populations and the vibrational temperature of N2 (C, v') in negative DC corona discharge are determined. The effects of discharge voltage, input power and added oxygen on the relative populations of OH (A2Σ) radicals and N2 (C3Πu) molecules in negative DC corona discharge are investigated. It is found that the relative populations of OH (A2Σ) radicals and N2 (C3Πu) molecules increase with increasing the discharge voltage and the input power and decrease with increasing the added oxygen. The emission spectra produced by positive DC corona discharge are also studied for comparing with negative DC corona discharge. However, the emission spectrum of OH (A2Σ → X2Π, 0-0) is not obtained in positive DC corona discharge, only the emission spectrum of N2 (C3Πu → B3Πg) is observed. The effects of discharge voltage and input power on the relative populations of N2 (C3Πu) molecules in positive DC corona discharge are also investigated. The relative populations of N2 (C3Πu) molecules increase with increasing the discharge voltage and the input power. The main involved physicochemical processes have been discussed.
PACS: 52.70.Kz – Optical / 52.80.Hc – Glow; corona / 82.33.Xj – Plasma reactions
© EDP Sciences, 2007
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