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dc.contributor.CRUESPUNIVERSIDADE DE ESTADUAL DE CAMPINASpt_BR
dc.identifier.isbnnullpt
dc.typeArtigo de periódicopt_BR
dc.titleElectronic Excitation Of H2 By Positron Impactpt_BR
dc.contributor.authorArretche F.pt_BR
dc.contributor.authorLima M.A.P.pt_BR
unicamp.authorArretche, F., Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-970, Campinas, São Paulo, Brazilpt_BR
unicamp.authorLima, M.A.P., Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-970, Campinas, São Paulo, Brazilpt_BR
dc.description.abstractRecent experiments on electronic excitation of molecules by positron impact have shown much larger cross sections than in the electron scattering case. The challenge of understanding the origin of this enhancement, especially just above electronic excitation thresholds, motivates the search of theoretical explanations of the phenomenon as well as new experimental efforts to confirm the data. In an earlier theoretical effort, an application of the Schwinger multichannel method at two-state level of approximation for the X Σg+1 â†B Σu+1 electronic excitation of the H2 molecule, gave cross sections with smaller magnitude but reasonable qualitative agreement with the experimental data. The purpose of this work was to study the numerical stability of the previous calculation and to investigate the influence of open channels (energetically accessible electronic statesâ€"multichannel effects) and closed channels (energetically inaccessible electronic statesâ€"polarization effects) on this transition. Our results show minor multichannel effects and a significative enhancement of the X Σg+1 â†'B Σu+1 cross section at the threshold due to polarization effects if compared to the usual static results. © 2006 The American Physical Society.en
dc.relation.ispartofPhysical Review A - Atomic, Molecular, and Optical Physicspt_BR
dc.publishernullpt_BR
dc.date.issued2006pt_BR
dc.identifier.citationPhysical Review A - Atomic, Molecular, And Optical Physics. , v. 74, n. 4, p. - , 2006.pt_BR
dc.language.isoenpt_BR
dc.description.volume74pt_BR
dc.description.issuenumber4pt_BR
dc.description.lastpagept_BR
dc.rightsabertopt_BR
dc.sourceScopuspt_BR
dc.identifier.issn10502947pt_BR
dc.identifier.doi10.1103/PhysRevA.74.042713pt_BR
dc.identifier.urlhttp://www.scopus.com/inward/record.url?eid=2-s2.0-33750023185&partnerID=40&md5=48fac53bcca72a9aad864beacdba59b2pt_BR
dc.date.available2015-06-30T18:14:35Z
dc.date.available2015-11-26T14:27:58Z-
dc.date.accessioned2015-06-30T18:14:35Z
dc.date.accessioned2015-11-26T14:27:58Z-
dc.description.provenanceMade available in DSpace on 2015-06-30T18:14:35Z (GMT). No. of bitstreams: 1 2-s2.0-33750023185.pdf: 605652 bytes, checksum: 9a2f1f8171327d3a0410e77ec5569027 (MD5) Previous issue date: 2006en
dc.description.provenanceMade available in DSpace on 2015-11-26T14:27:58Z (GMT). No. of bitstreams: 2 2-s2.0-33750023185.pdf: 605652 bytes, checksum: 9a2f1f8171327d3a0410e77ec5569027 (MD5) 2-s2.0-33750023185.pdf.txt: 44525 bytes, checksum: c84ce0035405cbdaf827da8be521584a (MD5) Previous issue date: 2006en
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/103647
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/103647-
dc.identifier.idScopus2-s2.0-33750023185pt_BR
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