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Atom and ion chemistry in low pressure hydrogen dc plasmas.
MedLine Citation:
PMID:  16671676     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The chemical composition of a low-pressure hydrogen dc plasma produced in a hollow cathode discharge has been measured and modeled. The concentrations of H atoms and of H(+), H(2)(+) and H(3)(+) ions were determined with a combination of optical spectroscopic and mass spectrometric techniques, over the range of pressures (p approximately 0.008-0.2 m bar) investigated. The results were rationalized with the help of a zero-order kinetic model. A comparatively high fraction ( approximately 0.1+/-0.05) of H atoms, indicative of a relatively small wall recombination, was observed. Low ionization degrees (<10(-4)) were obtained in all cases. In general, the ionic composition of the plasma was found to be dominated by H(3)(+), except at the lowest pressures, where H(2)(+) was the major ion. The key physicochemical processes determining the plasma composition were identified from the comparison of experimental and model results, and are discussed in the paper.
Authors:
I Méndez; F J Gordillo-Vazquez; V J Herrero; I Tanarro
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  110     ISSN:  1089-5639     ISO Abbreviation:  J Phys Chem A     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-04     Completed Date:  2007-09-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6060-6     Citation Subset:  -    
Affiliation:
Instituto de Estructura de la Materia, CSIC, Serrano 123, 28006 Madrid, Spain.
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