Publication
Cross sections for positron scattering from ethane
| Summary: | Agradecimentos: M.H.F.B. and S.d'A.S. acknowledge support from CNPq, FINEP (under Project CT-Infra) and from Fundação Araucária. M.T.doN.V. and M.A.P.L. acknowledge support from CNPq and FAPESP. S.d'A.S. and M.H.F.B acknowledge computational support from Professor Carlos M. de Carvalho at LFTC-DFis-UFPR and at LCPAD-UFPR. The authors also acknowledge computational support from CENAPAD-SP. We also acknowledge partial financial support from the Australian Research Council, through its Centres of Excellence program, and the University of Trento through a Memorandum of Understanding between it and the Flinders University node of the Centre for Antimatter-Matter Studies. One of us (M.J.B.) also thanks the University of Malaya for support through his "Distinguished Visiting Professorship" |
|---|---|
| Main Authors: | Lima, Marco Aurélio Pinheiro, 1957- |
| Subject: | Pósitrons - Espalhamento Pósitrons Positron scattering Positrons Artigo original |
| Year: | 2013 |
| Country: | Brazil |
| Document type: | article |
| Access type: | open access |
| Associated institution: | IBICT |
| Language: | English |
| Origin: | Oasisbr |
| _version_ | 1871524122725449728 |
|---|---|
| author | Lima, Marco Aurélio Pinheiro, 1957- |
| author_facet | Lima, Marco Aurélio Pinheiro, 1957- |
| author_role | author |
| country_str | BR |
| creators_json_txt | [{\"Person.name\":\"Lima, Marco Aurélio Pinheiro, 1957-\"}] |
| datacite.creators.creator.creatorName.fl_str_mv | Lima, Marco Aurélio Pinheiro, 1957- |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Pósitrons - Espalhamento Pósitrons Positron scattering Positrons Artigo original |
| datacite.titles.title.fl_str_mv | Cross sections for positron scattering from ethane |
| dc.creator.none.fl_str_mv | Lima, Marco Aurélio Pinheiro, 1957- |
| dc.description.none.fl_str_mv | Abstract: We report experimental and theoretical cross sections for positron scattering from the fundamental organic-chemistry molecule ethane (C2H6). The experimental total cross sections (TCSs) were obtained using a linear transmission technique, for energies in the range 0.1-70 eV and with an energy resolution of similar to 0.25 eV (full width at half maximum). Agreement, over the common energy range, with the earlier TCS measurements of Floeder et al. [J. Phys. B 18, 3347 (1985)] is excellent, while both the present results and those of Floeder et al. are consistently higher in magnitude than the data of Sueoka and Maori [J. Phys. B 19, 4035 (1986)]. The present calculations employed the Schwinger multichannel method and were performed in the static plus polarization approximation for energies up to 10 eV. Our calculated elastic integral cross sections (ICSs) indicate a Ramsauer-Townsend minimum at around 1.4 eV in the A(g) scattering symmetry, and a virtual state. In addition we calculated from our scattering cross section a scattering length of -13.83a(0). Agreement between our measured TCS and calculated elastic ICS is found to be only qualitative, although this is perhaps not so surprising given the TCS below 10 eV in principle includes contributions from rotational, vibrational, and electronic-state excitation and positronium formation whereas the calculation does not CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ FINANCIADORA DE ESTUDOS E PROJETOS - FINEP FUNDAÇÃO ARAUCÁRIA DE APOIO AO DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO DO ESTADO DO PARANÁ - FA FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP Fechado |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | https://hdl.handle.net/20.500.12733/6124 LIMA, Marco Aurélio Pinheiro. Cross sections for positron scattering from ethane. Physical review. A, Atomic, molecular and optical physics. College Park, MD : American Physical Society, 2013. Vol. 87, n. 3 (Mar., 2013), n. art. 032707, p. 1-7. Disponível em: https://hdl.handle.net/20.500.12733/6124. Acesso em: 24 mai. 2023. |
| dc.language.none.fl_str_mv | eng |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.source.none.fl_str_mv | reponame:Repositório da Produção Científica e Intelectual da Unicamp instname:Universidade Estadual de Campinas (UNICAMP) instacron:UNICAMP |
| dc.subject.none.fl_str_mv | Pósitrons - Espalhamento Pósitrons Positron scattering Positrons Artigo original |
| dc.title.fl_str_mv | Cross sections for positron scattering from ethane |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | Agradecimentos: M.H.F.B. and S.d'A.S. acknowledge support from CNPq, FINEP (under Project CT-Infra) and from Fundação Araucária. M.T.doN.V. and M.A.P.L. acknowledge support from CNPq and FAPESP. S.d'A.S. and M.H.F.B acknowledge computational support from Professor Carlos M. de Carvalho at LFTC-DFis-UFPR and at LCPAD-UFPR. The authors also acknowledge computational support from CENAPAD-SP. We also acknowledge partial financial support from the Australian Research Council, through its Centres of Excellence program, and the University of Trento through a Memorandum of Understanding between it and the Flinders University node of the Centre for Antimatter-Matter Studies. One of us (M.J.B.) also thanks the University of Malaya for support through his "Distinguished Visiting Professorship" |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| id | oasisbr_9e3fd87f9a3efe946deb105caf891e2b |
| identifier.url.fl_str_mv | https://hdl.handle.net/20.500.12733/6124 LIMA, Marco Aurélio Pinheiro. Cross sections for positron scattering from ethane. Physical review. A, Atomic, molecular and optical physics. College Park, MD : American Physical Society, 2013. Vol. 87, n. 3 (Mar., 2013), n. art. 032707, p. 1-7. Disponível em: https://hdl.handle.net/20.500.12733/6124. Acesso em: 24 mai. 2023. |
| identifier_str_mv | LIMA, Marco Aurélio Pinheiro. Cross sections for positron scattering from ethane. Physical review. A, Atomic, molecular and optical physics. College Park, MD : American Physical Society, 2013. Vol. 87, n. 3 (Mar., 2013), n. art. 032707, p. 1-7. Disponível em: https://hdl.handle.net/20.500.12733/6124. Acesso em: 24 mai. 2023. |
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| person_str_mv | Lima, Marco Aurélio Pinheiro, 1957- |
| publishDate | 2013 |
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| spelling | Cross sections for positron scattering from ethaneLima, Marco Aurélio Pinheiro, 1957-Pósitrons - EspalhamentoPósitronsPositron scatteringPositronsArtigo originalopen accesshttp://purl.org/coar/access_right/c_abf2https://hdl.handle.net/20.500.12733/6124HandleLIMA, Marco Aurélio Pinheiro. Cross sections for positron scattering from ethane. Physical review. A, Atomic, molecular and optical physics. College Park, MD : American Physical Society, 2013. Vol. 87, n. 3 (Mar., 2013), n. art. 032707, p. 1-7. Disponível em: https://hdl.handle.net/20.500.12733/6124. Acesso em: 24 mai. 2023.Handlehttps://repositorio.unicamp.br/acervo/detalhe/1247602URLHasVersionhttps://hdl.handle.net/20.500.12733/6124HandleLIMA, Marco Aurélio Pinheiro. Cross sections for positron scattering from ethane. Physical review. A, Atomic, molecular and optical physics. College Park, MD : American Physical Society, 2013. Vol. 87, n. 3 (Mar., 2013), n. art. 032707, p. 1-7. Disponível em: https://hdl.handle.net/20.500.12733/6124. Acesso em: 24 mai. 2023.Handle2013Agradecimentos: M.H.F.B. and S.d'A.S. acknowledge support from CNPq, FINEP (under Project CT-Infra) and from Fundação Araucária. M.T.doN.V. and M.A.P.L. acknowledge support from CNPq and FAPESP. S.d'A.S. and M.H.F.B acknowledge computational support from Professor Carlos M. de Carvalho at LFTC-DFis-UFPR and at LCPAD-UFPR. The authors also acknowledge computational support from CENAPAD-SP. We also acknowledge partial financial support from the Australian Research Council, through its Centres of Excellence program, and the University of Trento through a Memorandum of Understanding between it and the Flinders University node of the Centre for Antimatter-Matter Studies. One of us (M.J.B.) also thanks the University of Malaya for support through his "Distinguished Visiting Professorship"Abstract: We report experimental and theoretical cross sections for positron scattering from the fundamental organic-chemistry molecule ethane (C2H6). The experimental total cross sections (TCSs) were obtained using a linear transmission technique, for energies in the range 0.1-70 eV and with an energy resolution of similar to 0.25 eV (full width at half maximum). Agreement, over the common energy range, with the earlier TCS measurements of Floeder et al. [J. Phys. B 18, 3347 (1985)] is excellent, while both the present results and those of Floeder et al. are consistently higher in magnitude than the data of Sueoka and Maori [J. Phys. B 19, 4035 (1986)]. The present calculations employed the Schwinger multichannel method and were performed in the static plus polarization approximation for energies up to 10 eV. Our calculated elastic integral cross sections (ICSs) indicate a Ramsauer-Townsend minimum at around 1.4 eV in the A(g) scattering symmetry, and a virtual state. In addition we calculated from our scattering cross section a scattering length of -13.83a(0). Agreement between our measured TCS and calculated elastic ICS is found to be only qualitative, although this is perhaps not so surprising given the TCS below 10 eV in principle includes contributions from rotational, vibrational, and electronic-state excitation and positronium formation whereas the calculation does notCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFINANCIADORA DE ESTUDOS E PROJETOS - FINEPFUNDAÇÃO ARAUCÁRIA DE APOIO AO DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO DO ESTADO DO PARANÁ - FAFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPFechadoapplication/pdfreponame:Repositório da Produção Científica e Intelectual da Unicampinstname:Universidade Estadual de Campinas (UNICAMP)instacron:UNICAMPengVoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85journal articlehttp://purl.org/coar/resource_type/c_6501literature |
| spellingShingle | Cross sections for positron scattering from ethane Lima, Marco Aurélio Pinheiro, 1957- Pósitrons - Espalhamento Pósitrons Positron scattering Positrons Artigo original |
| status | SINGLETON |
| status_str | VoR |
| subject.fl_str_mv | Pósitrons - Espalhamento Pósitrons Positron scattering Positrons Artigo original |
| title | Cross sections for positron scattering from ethane |
| title_full | Cross sections for positron scattering from ethane |
| title_fullStr | Cross sections for positron scattering from ethane |
| title_full_unstemmed | Cross sections for positron scattering from ethane |
| title_short | Cross sections for positron scattering from ethane |
| title_sort | Cross sections for positron scattering from ethane |
| topic | Pósitrons - Espalhamento Pósitrons Positron scattering Positrons Artigo original |
| topic_facet | Pósitrons - Espalhamento Pósitrons Positron scattering Positrons Artigo original |
| url | https://hdl.handle.net/20.500.12733/6124 |
| visible | 1 |
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