Low-temperature inelastic collisions between hydrogen molecules and helium atoms

11 pages, 12 figures.-- PACS nrs.: 34.50.Ez, 34.20.-b, 33.15.Mt.-- PMID: 18554014 [PubMed].

Detalles Bibliográficos
Autores: Tejeda, Guzmán, Thibault, Franck, Fernández Sánchez, José María, Montero, Salvador
Tipo de recurso: artículo
Fecha de publicación:2008
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/8838
Acceso en línea:http://hdl.handle.net/10261/8838
Access Level:acceso abierto
Palabra clave:Atom-molecule collisions
Boltzmann equation
Helium
Hydrogen
Jets
Potential energy surfaces
Raman spectra
Rotational-vibrational energy transfer
Rotational-vibrational states
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spelling Low-temperature inelastic collisions between hydrogen molecules and helium atomsTejeda, GuzmánThibault, FranckFernández Sánchez, José MaríaMontero, SalvadorAtom-molecule collisionsBoltzmann equationHeliumHydrogenJetsPotential energy surfacesRaman spectraRotational-vibrational energy transferRotational-vibrational states11 pages, 12 figures.-- PACS nrs.: 34.50.Ez, 34.20.-b, 33.15.Mt.-- PMID: 18554014 [PubMed].Inelastic H(2):He collisions are studied from the experimental and theoretical points of view between 22 and 180 K. State-to-state cross sections and rates are calculated at the converged close-coupling level employing recent potential energy surfaces (PES): The MR-PES [J. Chem. Phys. 100, 4336 (1994)], and the MMR-PES and BMP-PESs [J. Chem. Phys. 119, 3187 (2003)]. The fundamental rates k(2-->0) and k(3-->1) for H(2):He collisions are assessed experimentally on the basis of a master equation describing the time evolution of rotational populations of H(2) in the vibrational ground state. These populations are measured in the paraxial region of supersonic jets of H(2)+He mixtures by means of high-sensitivity and high spatial resolution Raman spectroscopy. Good agreement between theory and experiment is found for the k(2-->0) rate derived from the MR-PES, but not for the BMP-PES. For the k(3-->1) rate, which is about one-third to one-half of k(2-->0), the result is less conclusive. The experimental k(3-->1) rate is compatible within experimental error with the values calculated from both PESs. In spite of this uncertainty, the global consistence of experiment and theory in the framework of Boltzmann equation supports the MR-PES and MMR-PESs, and the set of gas-dynamic equations employed to describe the paraxial region of the jet at a molecular level.This work has been supported by the Spanish Ministerio de Educación y Ciencia, research Project Nos. FIS2004-02576 and ESP2004-21060-E, and ASTROCAM network.Peer reviewedAmerican Institute of Physics200820082008info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501264184 bytesapplication/pdfhttp://hdl.handle.net/10261/8838reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1063/1.2938366info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/88382026-05-22T06:33:51Z
dc.title.none.fl_str_mv Low-temperature inelastic collisions between hydrogen molecules and helium atoms
title Low-temperature inelastic collisions between hydrogen molecules and helium atoms
spellingShingle Low-temperature inelastic collisions between hydrogen molecules and helium atoms
Tejeda, Guzmán
Atom-molecule collisions
Boltzmann equation
Helium
Hydrogen
Jets
Potential energy surfaces
Raman spectra
Rotational-vibrational energy transfer
Rotational-vibrational states
title_short Low-temperature inelastic collisions between hydrogen molecules and helium atoms
title_full Low-temperature inelastic collisions between hydrogen molecules and helium atoms
title_fullStr Low-temperature inelastic collisions between hydrogen molecules and helium atoms
title_full_unstemmed Low-temperature inelastic collisions between hydrogen molecules and helium atoms
title_sort Low-temperature inelastic collisions between hydrogen molecules and helium atoms
dc.creator.none.fl_str_mv Tejeda, Guzmán
Thibault, Franck
Fernández Sánchez, José María
Montero, Salvador
author Tejeda, Guzmán
author_facet Tejeda, Guzmán
Thibault, Franck
Fernández Sánchez, José María
Montero, Salvador
author_role author
author2 Thibault, Franck
Fernández Sánchez, José María
Montero, Salvador
author2_role author
author
author
dc.subject.none.fl_str_mv Atom-molecule collisions
Boltzmann equation
Helium
Hydrogen
Jets
Potential energy surfaces
Raman spectra
Rotational-vibrational energy transfer
Rotational-vibrational states
topic Atom-molecule collisions
Boltzmann equation
Helium
Hydrogen
Jets
Potential energy surfaces
Raman spectra
Rotational-vibrational energy transfer
Rotational-vibrational states
description 11 pages, 12 figures.-- PACS nrs.: 34.50.Ez, 34.20.-b, 33.15.Mt.-- PMID: 18554014 [PubMed].
publishDate 2008
dc.date.none.fl_str_mv 2008
2008
2008
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/8838
url http://hdl.handle.net/10261/8838
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1063/1.2938366
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 264184 bytes
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 reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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