Journal
JOURNAL OF APPLIED PHYSICS
Volume 110, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3638457
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- Ministry of Education, Culture, Sports, Science and Technology
- Grants-in-Aid for Scientific Research [20246051] Funding Source: KAKEN
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Plasma application for environmental improvement is desirable, and it is worthwhile to clarify the behavior of OH radicals in nonthermal plasma. Under atmospheric-pressure humid air, the time evolutions and spatial distribution of relative density and rotational temperature of OH radicals are measured in pulsed positive corona discharge using laser-induced fluorescence with a tunable optical parametric oscillator laser. The density of OH radicals generated by discharge when 28 kV is applied is estimated to be about 1 x 10(15) cm(-3) at 3 mu s after discharge. The OH density increases with humidity. The rotational temperature rises after discharge. The rate of temperature rise increases with humidity. This phenomenon arises from fast vibration-to-translation energy relaxation of H2O. The spatial distributions of OH rotational temperature indicate that the temperature rises in the secondary streamer channel. (C) 2011 American Institute of Physics. [doi:10.1063/1.3638457]
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