Optical study of radicals (OH,O, H,N) in a needle-plate bi-directional pulsed corona discharge |
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Authors: | F?Liu Email author" target="_blank">W?WangEmail author W?Zheng Y?Wang |
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Institution: | 1.State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology,Dalian,P.R. China |
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Abstract: | In this study, analysis of optical emission spectra are
used for the detection of OH (A2Σ) radicals and O (3p5P),
Hα (3P) and N (3p4P) active atoms produced by the
high-voltage bi-directional pulsed corona discharge of N2 and H2O
mixture gas in a needle-plate reactor at one atmosphere. The relative
vibrational populations and the vibrational temperature of N2 (C,
v') are determined. The effects of pulse peak voltage, pulse
repetition rate and the added O2 flow rate on the relative populations
of OH (A2Σ) radicals and O (3p5P), Hα (3P) and
N (3p4P) active atoms are investigated. It is found that when pulse
peak voltage and pulse repetition rate are increased, the relative
populations of those excited states radicals rise correspondingly. The
relative population of OH (A2Σ) radicals decreases with
increasing the flow rate of oxygen. The relative populations of O
(3p5P), Hα (3P) and N (3p4P) active atoms increase with
the flow rate of oxygen at first and exhibit a maximum value at about 30 ml/min. When the flow rate of oxygen is increased
further, the relative populations of those excited states active atoms decrease correspondingly. The main involved physicochemical
processes also have been discussed. |
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Keywords: | |
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