Near-threshold Vibrational Excitation Of H2 By Positron Impact: A Projection-operator Approach

dc.creatorVarella M.T.D.N.
dc.creatorLima M.A.P.
dc.date2007
dc.date2015-06-30T18:49:11Z
dc.date2015-11-26T14:36:43Z
dc.date2015-06-30T18:49:11Z
dc.date2015-11-26T14:36:43Z
dc.date.accessioned2018-03-28T21:40:45Z
dc.date.available2018-03-28T21:40:45Z
dc.identifier
dc.identifierPhysical Review A - Atomic, Molecular, And Optical Physics. , v. 76, n. 5, p. - , 2007.
dc.identifier10502947
dc.identifier10.1103/PhysRevA.76.052701
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-36048957498&partnerID=40&md5=d8a0ce1a6d7513a604ff0d3711e2311e
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/104933
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/104933
dc.identifier2-s2.0-36048957498
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1248870
dc.descriptionWe report vibrational excitation (νi =0→ νf =1) and total cross sections for positron scattering by H2. The Feshbach projection operator formalism was employed to vibrationally resolve the fixed-nuclei phase shifts obtained with the Schwinger multichannel method. The near-threshold behavior of the vibrational excitation cross section is in good agreement with available experimental data. Though our fixed-nuclei calculations do not indicate the existence of a e+ - H2 virtual state, a proper description of the T matrix threshold behavior is essential (the adiabatic approximation is inadequate). The projection operator approach has long been a powerful tool for studies of nuclear dynamics in electron-molecule collisions, and its application to positron scattering is timely since couplings to nuclear degrees of freedom are known to be very important at low impact energies. © 2007 The American Physical Society.
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dc.languageen
dc.publisher
dc.relationPhysical Review A - Atomic, Molecular, and Optical Physics
dc.rightsaberto
dc.sourceScopus
dc.titleNear-threshold Vibrational Excitation Of H2 By Positron Impact: A Projection-operator Approach
dc.typeArtículos de revistas


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