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Title

Ion Chemistry in Cold Plasmas of H2 with CH4 and N2

AuthorsTanarro, Isabel ; Herrero, Víctor J. ; Islyaikin, Andrey M. ; Méndez, Isabel; Tabarés, Francisco L.; Tafalla, D.
Issue Date28-Aug-2007
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry A 111(37): 9003–9012 (2007)
AbstractThe distributions of ions and neutrals in low-pressure (≈10-2 mbar) DC discharges of pure hydrogen and hydrogen with small admixtures (5%) of CH4 and N2 have been determined by mass spectrometry. Besides the mentioned plasma precursors, appreciable amounts of NH3 and C2Hx hydrocarbons, probably mostly from wall reactions, are detected in the gas phase. Primary ions, formed by electron impact in the glow region, undergo a series of charge transfer and reactive collisions that determine the ultimate ion distribution in the various plasmas. A comparison of the ion mass spectra for the different mixtures, taking into account the mass spectra of neutrals, provides interesting information on the key reactions among ions. The prevalent ion is H3+ in all cases, and the ion chemistry is dominated by protonation reactions of this ion and some of its derivatives. Besides the purely hydrogenic ions, N2H+, NH4+, and CH5+ are found in significant amounts. The only mixed C/N ion clearly identified is protonated acetonitrile C2H4N+. The results suggest that very little HCN is formed in the plasmas under study.
Description10 pages, 5 figures.-- Printed version published Sep 20, 2007.
Publisher version (URL)http://dx.doi.org/10.1021/jp073569w
URIhttp://hdl.handle.net/10261/14502
DOI10.1021/jp073569w
ISSN1089-5639
Appears in Collections:(CFMAC-IEM) Artículos
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