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|Type:||Artigo de periódico|
|Title:||Superelastic Collisions Of Electrons With The C 3Πu Metastable State In Hydrogen Dc Positive Column|
Da Paixao F.J.
|Abstract:||We investigated the effect of superelastic electronic collisions of electrons, with the c 3Πu state of the H2 molecule, on the electron energy distribution function (eedf) of a dc positive column. We use a recently calculated set of electronic superelastic collision cross-sections [C.S. Sartori, F.J. da Paixão, M.A.P. Lima, Phys. Rev. A 55 (1997) 3243] to study the effect of these collisions on the eedf, the transport parameters, ionization and dissociation rates. We include two possible pathways, c 3Πu → b 3Σ+ u and c 3Πu → X 1Σ+ g, for superelastic collisions of electrons with molecules in the metastable state. Cross-sections of the order of 10-14 cm2 at low energy enhance the eedf tail by superelastic electronic collisions, in particular for low reduced electric field E/N. This result changes considerably the dissociation and ionization rates by six orders of magnitude in the region from 10 to 50 Td.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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