期刊
PLASMA SOURCES SCIENCE & TECHNOLOGY
卷 27, 期 9, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6595/aadf01
关键词
atmospheric pressure plasma jet; cavity ring-down spectroscopy; hydroperoxyl radical
资金
- Natural Environment Research Council (NERC) [NE/M016439/1]
- Leibniz Competition 2015 [SAW-2015-INP-5]
- Ministry of Education, Science and Culture of the State of Mecklenburg-Vorpommern [AU15001]
- European Union Seventh Framework Programme FP7/2007-2013 [316216]
Hydroperoxyl (HO2) is detected in the effluent of an atmospheric pressure plasma jet (PJ) by cavity ring-down absorption spectroscopy. Laser radiation at 1506.4 nm is used to determine HO2 concentrations directly in the plasma effluent at atmospheric pressure as well as indirectly after sampling through a pinhole and expanding to 5.33 kPa. To unravel the HO2 reaction kinetics, the argon feed gas is humidified and the PJ is equipped with a gas curtain device that controls the surrounding atmosphere. Varying the curtain gas composition from pure nitrogen to pure oxygen leads to a five to six-fold increase in HO2 concentrations towards higher oxygen concentrations. A reaction kinetics model considering near-field and far-field reactions describes the reaction pathways that determine the hydroperoxyl concentration and is in good agreement with the measurements at both low and atmospheric pressure.
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