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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/64307
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dc.creatorLuis Argel Poveda Calviñopt_BR
dc.creatorJosé Rachid Mohallempt_BR
dc.date.accessioned2024-02-20T12:58:40Z-
dc.date.available2024-02-20T12:58:40Z-
dc.date.issued2022-
dc.citation.volume10pt_BR
dc.citation.spage1pt_BR
dc.citation.epage7pt_BR
dc.identifier.doihttps://doi.org/10.3389/fphy.2022.890426pt_BR
dc.identifier.issn2296-424Xpt_BR
dc.identifier.urihttp://hdl.handle.net/1843/64307-
dc.description.resumoIn a previous work [Poveda, Varella, and Mohallem (Poveda et al., Atoms, 2021, 9: 64) it was shown that the bell-like shape of the 0 → 1 vibrational excitation cross section of H2 as a function of the incoming positron energy, with its characteristic sharp onset at threshold, can be accounted for by a simple model which couples the positron to the vibrational mode of the molecule, throught the behavior of the target polarizabitity with the internuclear bond distance. The study, carried out via time-dependent wave-packet dynamics propagation, relies on a two-dimensional potential energy surface involving just the scattering (positron-target) and vibrational (target) coordinates. Here the model is extended to the full three-dimensional configuration space of the positron-diatomic complex, with the cross sections computed within a time-independent close-coupling approach. The present results confirm the previous findings, shedding light on the mechanisms through which a low-energy positron couples to the molecular vibrations.pt_BR
dc.format.mimetypepdfpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE FÍSICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofFrontiers in Physics-
dc.rightsAcesso Abertopt_BR
dc.subjectPositron scatteringpt_BR
dc.subjectClose-coupling methodpt_BR
dc.subjectElastic cross sectionpt_BR
dc.subjectVibrational excitation cross sectionpt_BR
dc.subjectPositron annihilationpt_BR
dc.subject.otherPositronspt_BR
dc.titleOn the role of molecular polarizability in positron coupling to vibrations in homonuclear diatomicspt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.frontiersin.org/articles/10.3389/fphy.2022.890426/fullpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-9120-453Xpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-4776-4417pt_BR
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