Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Physics |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000400002 |
Resumo: | Single differential cross-sections for transfer-loss (TL) leading to the production of O5+(1s2s³S)nl4L states were computed for 0.2-1.2 MeV/u collisions of O5+(1s²2s) ions with He and H2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3-4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL. Within the independent particle model (IPM), the probability of 1s electron loss from O5+(1s²2s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O5+(1s2s³S)nl4L states (n > 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2(4)P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p4P states, particularly for collisions with the H2 target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements. |
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Brazilian Journal of Physics |
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Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targetsMetastable statesCascade feedingIon-atom collisionsElectron captureSingle differential cross-sections for transfer-loss (TL) leading to the production of O5+(1s2s³S)nl4L states were computed for 0.2-1.2 MeV/u collisions of O5+(1s²2s) ions with He and H2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3-4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL. Within the independent particle model (IPM), the probability of 1s electron loss from O5+(1s²2s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O5+(1s2s³S)nl4L states (n > 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2(4)P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p4P states, particularly for collisions with the H2 target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements.Sociedade Brasileira de Física2006-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000400002Brazilian Journal of Physics v.36 n.2b 2006reponame:Brazilian Journal of Physicsinstname:Sociedade Brasileira de Física (SBF)instacron:SBF10.1590/S0103-97332006000400002info:eu-repo/semantics/openAccessZouros,T. J. M.Sulik,B.Gulyás,L.Orbán,A.eng2006-07-31T00:00:00Zoai:scielo:S0103-97332006000400002Revistahttp://www.sbfisica.org.br/v1/home/index.php/pt/ONGhttps://old.scielo.br/oai/scielo-oai.phpsbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br1678-44480103-9733opendoar:2006-07-31T00:00Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF)false |
dc.title.none.fl_str_mv |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets |
title |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets |
spellingShingle |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets Zouros,T. J. M. Metastable states Cascade feeding Ion-atom collisions Electron capture |
title_short |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets |
title_full |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets |
title_fullStr |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets |
title_full_unstemmed |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets |
title_sort |
Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets |
author |
Zouros,T. J. M. |
author_facet |
Zouros,T. J. M. Sulik,B. Gulyás,L. Orbán,A. |
author_role |
author |
author2 |
Sulik,B. Gulyás,L. Orbán,A. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Zouros,T. J. M. Sulik,B. Gulyás,L. Orbán,A. |
dc.subject.por.fl_str_mv |
Metastable states Cascade feeding Ion-atom collisions Electron capture |
topic |
Metastable states Cascade feeding Ion-atom collisions Electron capture |
description |
Single differential cross-sections for transfer-loss (TL) leading to the production of O5+(1s2s³S)nl4L states were computed for 0.2-1.2 MeV/u collisions of O5+(1s²2s) ions with He and H2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3-4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL. Within the independent particle model (IPM), the probability of 1s electron loss from O5+(1s²2s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O5+(1s2s³S)nl4L states (n > 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2(4)P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p4P states, particularly for collisions with the H2 target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000400002 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000400002 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-97332006000400002 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
dc.source.none.fl_str_mv |
Brazilian Journal of Physics v.36 n.2b 2006 reponame:Brazilian Journal of Physics instname:Sociedade Brasileira de Física (SBF) instacron:SBF |
instname_str |
Sociedade Brasileira de Física (SBF) |
instacron_str |
SBF |
institution |
SBF |
reponame_str |
Brazilian Journal of Physics |
collection |
Brazilian Journal of Physics |
repository.name.fl_str_mv |
Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF) |
repository.mail.fl_str_mv |
sbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br |
_version_ |
1754734862991884288 |