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Optical study of OH radical in a needle-plate DC corona discharge

Published online by Cambridge University Press:  21 March 2007

W. Zheng ,
F. Liu ,
W. Wang  and
D. Wang
W. Zheng
Affiliation:
State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian, 116024, P.R. China
F. Liu
Affiliation:
State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian, 116024, P.R. China
W. Wang*
Affiliation:
State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian, 116024, P.R. China
D. Wang
Affiliation:
State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian, 116024, P.R. China
*
wangwenc@dlut.edu.cn
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Abstract

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.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 38 , Issue 2 , May 2007 , pp. 153 - 159
Copyright
© EDP Sciences, 2007

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