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Low presure H2 plasmas: the Universe vs the Lab

AuthorsTanarro, Isabel ; Herrero, Víctor J. ; Doménech, José Luis ; Jiménez-Redondo, Miguel ; Cueto, Maite ; Cernicharo, José
Issue Date17-Jan-2014
AbstractCold plasmas of molecular precursors produced in low pressure glow discharges involve complex mechanisms of great interest in many scientific and technological fields, such as thin film growth, surface conditioning and so on. In particular, hydrogen containing cold plasmas are currently used in microelectronic devices production, can simulate the border conditions of plasmas generated in fusion reactors, and are efficient sources of very reactive radicals and ions, unstable under ordinary conditions, whose study can greatly contribute to clarify the appearance of complex and very interesting compounds in interstellar molecular clouds or in the ionospheres of Jovian planets. In this presentation, the main mechanisms controlling the behavior of low pressure glow discharges of mixtures of H2 with simple molecules are studied by experimental diagnostics and kinetic modeling. The formation of new stable neutral products takes place mainly at the reactor surfaces, and competes with the fast wall recycling of the precursors, dissociated previously by electron impact. The ion distributions result mainly from the balance between electron impact ionizations, which depend markedly on electron energies, and ion-molecule reactions in gas phase, for which the proton affinity of the different neutral species plays a major role. The discovering for the first time in the interstellar space of a new species, the ammonium ion, is finally presented as a successful joint result of recent laboratory data and astronomical surveys.
DescriptionConferencia presentada en: Physikalisches Kolloquium, Ruhr‐Universität Bochum, 2014‐1‐20. 57 diap.
Appears in Collections:(CFMAC-IEM) Comunicaciones congresos
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