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Title

Low-Pressure DC Air Plasmas. Investigation of Neutral and Ion Chemistry

AuthorsCastillo, M.; Méndez, Isabel; Islyaikin, Andrey M.; Herrero, Víctor J. CSIC ORCID; Tanarro, Isabel CSIC ORCID
KeywordsPlasmas
Low-pressure
Electron
Ion
Neutral species
Issue Date28-Jun-2005
PublisherAmerican Chemical Society
CitationThe Journal of Physical Chemistry A 109(28): 6255-6263 (2005)
AbstractThe neutral and charged species present in a direct current (dc) hollow cathode, gas flow, air reactor are experimentally studied by quadrupole mass spectrometry. The degree of ionization of the plasma and the electron mean temperature with decreasing air pressure, for constant discharge current, are measured with a double Langmuir probe. The chemical composition of the plasma changes appreciably over the 3x10(-3) to 5x10(-2) mbar range investigated: at the lowest pressures studied, O2 dissociation is up to 60% and the concentration of NO is half that of N2; concerning ions, NO+ and N2+ are dominant for the whole pressure range. A kinetic model of the plasma including electrons, neutrals, and positive ions is developed to account for the experimental observations; it is consistent with energy balance and predicts that heterogeneous processes are the main source of NO and that the contribution of ions to the global chemistry of neutrals is of minor significance even for the lowest pressures.
Description9 pages, 7 figures, 1 table.-- Printed version published Jul 21, 2005.
Publisher version (URL)http://dx.doi.org/10.1021/jp051318m
URIhttp://hdl.handle.net/10261/17353
DOI10.1021/jp051318m
ISSN1089-5639
Appears in Collections:(CFMAC-IEM) Artículos

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