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Ion kinetics in Ar/H2 cold plasmas: the relevance of ArH

Jiménez-Redondo, Miguel ; Cueto, Maite ; Doménech, José Luis ; Tanarro, Isabel ; Herrero, Víctor J

RSC advances, 2014-11, Vol.4 (17), p.623-6241 [Periódico revisado por pares]

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  • Título:
    Ion kinetics in Ar/H2 cold plasmas: the relevance of ArH
  • Autor: Jiménez-Redondo, Miguel ; Cueto, Maite ; Doménech, José Luis ; Tanarro, Isabel ; Herrero, Víctor J
  • Assuntos: Cold plasmas ; Density ; Displacement ; Electron temperature ; Interstellar matter ; Ion concentration ; Ion distribution ; Plasma pressure
  • É parte de: RSC advances, 2014-11, Vol.4 (17), p.623-6241
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The recent discovery of ArH + in the interstellar medium has aroused an interest for this ion in chemistry. In this work, the ion-molecule kinetics of cold plasmas of Ar/H 2 is investigated in glow discharges spanning the whole range of [H 2 ]/([H 2 ] + [Ar]) proportions for two pressures, 1.5 Pa and 8 Pa. Ion concentrations are determined by mass spectrometry, and electron temperatures and densities, with Langmuir probes. A kinetic model is used for the interpretation of the results. The selection of experimental conditions evinces relevant changes with plasma pressure in the ion distributions dependence with the H 2 fraction, particularly for the major ions: Ar + , ArH + and H 3 + . At 1.5 Pa, ArH + prevails for a wide interval of H 2 fractions: 0.3 < [H 2 ]/([H 2 ] + [Ar]) < 0.7. Nevertheless, a pronounced displacement of the ArH + maximum towards the lowest H 2 fractions is observed at 8 Pa, in detriment of Ar + , which becomes restricted to very small [H 2 ]/([H 2 ] + [Ar]) ratios, whereas H 3 + becomes dominant for all [H 2 ]/([H 2 ] + [Ar]) > 0.1. The analysis of the data with the kinetic model allows for the identification of the sources and sinks of the major ions over the whole range of experimental conditions sampled. Two key factors turn out to be responsible for the different ion distributions observed: the electron temperature, which determines the rate of Ar + formation and thus of ArH + , and the equilibrium ArH + + H 2 H 3 + + Ar, which can be strongly dependent of the degree of vibrational excitation of H 3 + . The results are discussed and compared with previously published data on other Ar/H 2 plasmas. The only noble gas compound observed in space, ArH + , is investigated in cold Ar/H 2 laboratory plasmas.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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