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《Spectroscopy and Spectral Analysis》 2005-01
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Emission Spectra of Hydroxyl Radical Generated in Air Corona Discharge

SUN Ming1, WU Yan1, ZHANG Jia-liang2, LI Jie1, WANG Ning-hui1, WU Jiang1, SHANG Ke-feng1 1. Institute of Electrostatics and Specific Power, Dalian University of Technology, Dalian 116024, China 2. The State Key Laboratory for Material Modification, Dalian University of Technology, Dalian 116024, China  
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.
【Fund】: 国家“863”计划课题(2001AA642010);; 国家自然科学基金(10276008)资助项目
【CateGory Index】: O461
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