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

AutorCastillo, M.; Méndez, Isabel; Islyaikin, Andrey M.; Herrero, Víctor J. ; Tanarro, Isabel
Palabras clavePlasmas
Neutral species
Fecha de publicación28-jun-2005
EditorAmerican Chemical Society
CitaciónThe Journal of Physical Chemistry A 109(28): 6255-6263 (2005)
ResumenThe 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.
Descripción9 pages, 7 figures, 1 table.-- Printed version published Jul 21, 2005.
Versión del editorhttp://dx.doi.org/10.1021/jp051318m
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