title: Optical study of OH radical in a wire-plate pulsed corona discharge.
abstract: In this study, the emission spectra of OH (A2sigma --> X2pi, 0-0) emitted from the high-voltage pulsed corona discharge (HVPCD) of N2 and H2O mixture gas and humid air in a wire-plate reactor were successfully recorded against a severe electromagnetic interference coming from HVPCD at one atmosphere. The relative vibrational populations and the vibrational temperature of N2 (C, v') were determined. The emission spectra of the deltaupsilon = +1 (1-0, 2-1, 3-2, 4-3) vibration transition band of N2 (C3pi(u) --> B3pi(g)) is simulated through gauss distribution. The emission intensity of OH (A2sigma --> X2pi, 0-0) has been exactly gotten by subtracting the emission intensity of the deltaupsilon = +1 vibration transition band of N2 (C3pi(u) --> B3pi(g)) from the overlapping spectra. The relative population of OH (A2sigma) has been obtained by the emission intensity of OH (A2sigma --> X2pi, 0-0) and Einstein's transition probability. The influences of pulsed peak voltage and pulse repetition rate on the relative population of OH (A2sigma) radicals in N2 and H2O mixture gas and humid air are investigated separately. It is found that the relative population of OH (A2sigma) rises linearly with increasing the applied peak voltage and the pulse repetition rate. When the oxygen is added in N2 and H2O mixture gas, the relative population of OH (A2sigma) radicals decreases exponentially with increasing the added oxygen. The main involved physicochemical processes have also been discussed.
authors: State Key Laboratory of Materials Modification by Laser, Ion and Electron beams, Dalian University of Technology, Dalian 116024, PR China. wangwenc@dlut.edu.cn
authors: Wenchun
authors: W
authors: Wang
authors: Su
authors: S
authors: Wang
authors: Feng
authors: F
authors: Liu
authors: Wei
authors: W
authors: Zheng
authors: Dezhen
authors: D
authors: Wang
mesh_terms: D017665:Hydroxyl Radical / Q000737:chemistry*; D055095:Optics and Photonics; D010100:Oxygen; D013057:Spectrum Analysis; D013696:Temperature; D014732:Vibration
chemical_list: D017665:Hydroxyl Radical; D010100:Oxygen