title: [Emission spectra of hydroxyl radical generated in air corona discharge].
abstract: In this paper, the relative emission intensity of the 309 nm transition band of hydroxyl radical (OH) was measured by a CCD imaging spectrometer in a pin-plane corona discharge scheme of one atmosphere pressure air injected with unsaturated water vapor from the central hole of the used pins. The influences of several factors on the OH radical production were investigated by relative emission intensity measurement. The production of OH radical increased with a limited increment of water vapor concentration in the mixed gas. Compared with positive DC corona discharges, more OH radicals were generated in positive pulsed corona discharges and less in negative DC corona discharges. The spatial distribution of OH radical production was also observed. Most OH radicals were produced within the range of 5 mm off the discharge pin electrode. In conclusion, this means of optical emission spectroscopy, compared with more sophisticated laser fluorescence measurements used for plasma OH production diagnostics investigation, is simpler and more effective for characterizing the OH radical potential for pollutant oxidation.
authors.affiliation: Institute of Electrostatics and Specific Power, Dalian University of Technology, Dalian 116024, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Sun
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.forename: Jia-Liang
authors.initials: JL
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Ning-Hui
authors.initials: NH
authors.lastname: Wang
authors.forename: Jiang
authors.initials: J
authors.lastname: Wu
authors.forename: Ke-Feng
authors.initials: KF
authors.lastname: Shang
mesh_terms: D000388:Air / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods; D005740:Gases / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry*; D010084:Oxidation-Reduction; D013057:Spectrum Analysis / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D005740:Gases; D014867:Water; D017665:Hydroxyl Radical