Formation of H- ions via vibrational excited molecules produced from recombinative wall desorption of H atoms in a low-pressure H/sub 2/ positive column

J. Amorim, J. Loureiro, D.C. Schram

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Abstract

Recombinative wall desorption of hydrogen atoms in a low-pressure hydrogen positive column leading to formation of H/sub 2/ (X/sup 1/ Sigma /sub g//sup +/, v) molecules in optimum levels for H/sup -/ production by dissociative attachment is investigated. We employed a kinetic model that solves the Boltzmann equations for electrons, coupled to a set of rate balance equations for vibrational levels H/sub 2/ (X/sup 1/ Sigma /sub g//sup +/, v), dissociated atoms H(1s) and negative ions H/sup -/. It is shown that the relative concentration [H/sup -/]/[H/sub 2/] is two times greater when recombinative wall desorption of H atoms is included in the model, for discharge pressures in the range p = 0.03-1.0 Torr and currents of 5 and 20 mA
Original languageEnglish
Pages (from-to)443-448
JournalChemical Physics Letters
Volume346
Issue number5-6
DOIs
Publication statusPublished - 2001

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