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Chemistry in glow discharges of H2 / O2 mixtures. Diagnostics and modelling

AuthorsJiménez-Redondo, Miguel ; Carrasco, Esther ; Herrero, Víctor J. ; Tanarro, Isabel
KeywordsPlasma kinetics
H2 + O2 low pressure discharges
Plasma diagnostics and modelling
Ions and neutrals plasma chemistry
Issue Date8-Jan-2015
PublisherInstitute of Physics Publishing
CitationPlasma Sources Science and Technology, 24: 015029 (2015)
AbstractThe chemistry of low pressure H2 + O2 discharges with different mixture ratios has been studied in a hollow cathode DC reactor. Neutral and positive ion distributions have been measured by mass spectrometry, and Langmuir probes have been used to provide charge densities and electron temperatures. A simple zero order kinetic model including neutral species and positive and negative ions, which takes into account gas-phase and heterogeneous chemistry, has been used to reproduce the global composition of the plasmas over the whole range of mixtures experimentally studied, and allows for the identification of the main physicochemical mechanisms that may explain the experimental results. To our knowledge, no combined experimental and modelling studies of the heavy species kinetics of low pressure H2 + O2 plasmas including ions has been reported before. As expected, apart from the precursors, H2O is detected in considerable amounts. The model also predicts appreciable concentrations of H and O atoms and the OH radical. The relevance of the metastable species O(1D) and O2(a1Δg) is analysed. Concerning the charged species, positive ion distributions are dominated by H3O+ for a wide range of intermediate mixtures, while H3 + and O2 + are the major ions for the higher and lower H2/O2 ratios, respectively. The mixed ions OH+, H2O+ and HO2 + are also observed in small amounts. Negative ions are shown to have a limited relevance in the global chemistry; their main contribution is the reduction of the electron density available for electron impact processes. © 2015 IOP Publishing
Description26 pags. ; 2 tabs. ; 6 figs.
Publisher version (URL)http://dx.doi.org/10.1088/0963-0252/24/1/015029
Appears in Collections:(CFMAC-IEM) Artículos
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