Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He

The interaction of a number of impurities (H2, Ag, Cu, Ag2, Cu2, Li, He+3, He* (3S), He2∗ (3Σu), and e−) with quantized rectilinear vortex lines in superfluid 4He is calculated by using the Orsay-Trento density functional theory (DFT) method at 0 K. The Donnelly-Parks (DP) potential function binding...

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Detalles Bibliográficos
Autores: Mateo Valderrama, David, Eloranta, Jussi, Williams, Gary A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/151854
Acceso en línea:https://hdl.handle.net/2445/151854
Access Level:acceso abierto
Palabra clave:Vòrtexs
Superfluïdesa
Teoria del funcional de densitat
Vortex-motion
Superfluidity
Density functionals
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spelling Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4HeMateo Valderrama, DavidEloranta, JussiWilliams, Gary A.VòrtexsSuperfluïdesaTeoria del funcional de densitatVortex-motionSuperfluidityDensity functionalsThe interaction of a number of impurities (H2, Ag, Cu, Ag2, Cu2, Li, He+3, He* (3S), He2∗ (3Σu), and e−) with quantized rectilinear vortex lines in superfluid 4He is calculated by using the Orsay-Trento density functional theory (DFT) method at 0 K. The Donnelly-Parks (DP) potential function binding ions to the vortex is combined with DFT data, yielding the impurity radius as well as the vortex line core parameter. The vortex core parameter at 0 K (0.74 Å) obtained either directly from the vortex line geometry or through the DP potential fitting is smaller than previously suggested but is compatible with the value obtained from re-analysis of the Rayfield-Reif experiment. All of the impurities have significantly higher binding energies to vortex lines below 1 K than the available thermal energy, where the thermally assisted escape process becomes exponentially negligible. Even at higher temperatures 1.5-2.0 K, the trapping times for larger metal clusters are sufficiently long that the previously observed metal nanowire assembly in superfluid helium can take place at vortex lines. The binding energy of the electron bubble is predicted to decrease as a function of both temperature and pressure, which allows adjusting the trap depth for either permanent trapping or to allow thermally assisted escape. Finally, a new scheme for determining the trapping of impurities on vortex lines by optical absorption spectroscopy is outlined and demonstrated for HeAmerican Institute of Physics2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/151854Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1063/1.4907597Journal of Chemical Physics, 2015, vol. 142, p. 064510https://doi.org/10.1063/1.4907597(c) American Institute of Physics , 2015info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1518542026-05-27T06:46:51Z
dc.title.none.fl_str_mv Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
title Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
spellingShingle Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
Mateo Valderrama, David
Vòrtexs
Superfluïdesa
Teoria del funcional de densitat
Vortex-motion
Superfluidity
Density functionals
title_short Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
title_full Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
title_fullStr Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
title_full_unstemmed Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
title_sort Interaction of ions, atoms, and small molecules with quantized vortex lines in superfluid 4He
dc.creator.none.fl_str_mv Mateo Valderrama, David
Eloranta, Jussi
Williams, Gary A.
author Mateo Valderrama, David
author_facet Mateo Valderrama, David
Eloranta, Jussi
Williams, Gary A.
author_role author
author2 Eloranta, Jussi
Williams, Gary A.
author2_role author
author
dc.subject.none.fl_str_mv Vòrtexs
Superfluïdesa
Teoria del funcional de densitat
Vortex-motion
Superfluidity
Density functionals
topic Vòrtexs
Superfluïdesa
Teoria del funcional de densitat
Vortex-motion
Superfluidity
Density functionals
description The interaction of a number of impurities (H2, Ag, Cu, Ag2, Cu2, Li, He+3, He* (3S), He2∗ (3Σu), and e−) with quantized rectilinear vortex lines in superfluid 4He is calculated by using the Orsay-Trento density functional theory (DFT) method at 0 K. The Donnelly-Parks (DP) potential function binding ions to the vortex is combined with DFT data, yielding the impurity radius as well as the vortex line core parameter. The vortex core parameter at 0 K (0.74 Å) obtained either directly from the vortex line geometry or through the DP potential fitting is smaller than previously suggested but is compatible with the value obtained from re-analysis of the Rayfield-Reif experiment. All of the impurities have significantly higher binding energies to vortex lines below 1 K than the available thermal energy, where the thermally assisted escape process becomes exponentially negligible. Even at higher temperatures 1.5-2.0 K, the trapping times for larger metal clusters are sufficiently long that the previously observed metal nanowire assembly in superfluid helium can take place at vortex lines. The binding energy of the electron bubble is predicted to decrease as a function of both temperature and pressure, which allows adjusting the trap depth for either permanent trapping or to allow thermally assisted escape. Finally, a new scheme for determining the trapping of impurities on vortex lines by optical absorption spectroscopy is outlined and demonstrated for He
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/151854
url https://hdl.handle.net/2445/151854
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1063/1.4907597
Journal of Chemical Physics, 2015, vol. 142, p. 064510
https://doi.org/10.1063/1.4907597
dc.rights.none.fl_str_mv (c) American Institute of Physics , 2015
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Institute of Physics , 2015
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Institute of Physics
publisher.none.fl_str_mv American Institute of Physics
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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