Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores

Time correlation functions between the velocity of a tagged particle and velocities of particles within specified ranges of initial separations have been obtained by molecular dynamics simulation. These correlation functions have allowed us to analyze the momentum transfer between particles in diffe...

ver descrição completa

Detalhes bibliográficos
Autores: Verdaguer Prats, Albert, Padró i Cárdenas, Joan Àngel
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2000
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/18885
Acesso em linha:https://hdl.handle.net/2445/18885
Access Level:acceso abierto
Palavra-chave:Estructura cristal·lina (Sòlids)
Cristal·lografia
Teoria del transport
Matèria condensada
Layer structure (Solids)
Crystallography
Transport theory
Condensed matter
id ES_71763801d02b59de17e92ff1fd1f03e0
oai_identifier_str oai:diposit.ub.edu:2445/18885
network_acronym_str ES
network_name_str España
repository_id_str
spelling Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential coresVerdaguer Prats, AlbertPadró i Cárdenas, Joan ÀngelEstructura cristal·lina (Sòlids)Cristal·lografiaTeoria del transportMatèria condensadaLayer structure (Solids)CrystallographyTransport theoryCondensed matterTime correlation functions between the velocity of a tagged particle and velocities of particles within specified ranges of initial separations have been obtained by molecular dynamics simulation. These correlation functions have allowed us to analyze the momentum transfer between particles in different coordination shells. Two simple liquids at very different densities and two purely repulsive potentials with very different softnesses have been considered. The longitudinal correlations, which are the velocity cross-correlations along the initial direction defined by the centers of two given particles, have been calculated separately. It has been proven that these correlations should be attributed to particles both in front of and behind the central one. As with propagating longitudinal modes, they are strongly dependent on the softness of the potential core. Some characteristic features of the velocity correlation functions after the initial rise should be related to nonlongitudinal correlations. It has been shown that velocity cross-correlations between distinct particles cannot only be attributed to the direct interactions among particles, but also to the motions induced by the movement of a tagged particle on their neighbors.The American Physical Society2000info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/18885Articles publicats en revistes (Física de la Matèria Condensada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: http://dx.doi.org/10.1103/PhysRevE.62.532Physical Review e, 2000, vol. 62, núm. , p. 532-537http://dx.doi.org/10.1103/PhysRevE.62.532(c) American Physical Society, 2000info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/188852026-05-27T06:46:51Z
dc.title.none.fl_str_mv Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
title Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
spellingShingle Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
Verdaguer Prats, Albert
Estructura cristal·lina (Sòlids)
Cristal·lografia
Teoria del transport
Matèria condensada
Layer structure (Solids)
Crystallography
Transport theory
Condensed matter
title_short Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
title_full Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
title_fullStr Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
title_full_unstemmed Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
title_sort Velocity cross-correlations and atomic momentum transfer in simple liquids with different potential cores
dc.creator.none.fl_str_mv Verdaguer Prats, Albert
Padró i Cárdenas, Joan Àngel
author Verdaguer Prats, Albert
author_facet Verdaguer Prats, Albert
Padró i Cárdenas, Joan Àngel
author_role author
author2 Padró i Cárdenas, Joan Àngel
author2_role author
dc.subject.none.fl_str_mv Estructura cristal·lina (Sòlids)
Cristal·lografia
Teoria del transport
Matèria condensada
Layer structure (Solids)
Crystallography
Transport theory
Condensed matter
topic Estructura cristal·lina (Sòlids)
Cristal·lografia
Teoria del transport
Matèria condensada
Layer structure (Solids)
Crystallography
Transport theory
Condensed matter
description Time correlation functions between the velocity of a tagged particle and velocities of particles within specified ranges of initial separations have been obtained by molecular dynamics simulation. These correlation functions have allowed us to analyze the momentum transfer between particles in different coordination shells. Two simple liquids at very different densities and two purely repulsive potentials with very different softnesses have been considered. The longitudinal correlations, which are the velocity cross-correlations along the initial direction defined by the centers of two given particles, have been calculated separately. It has been proven that these correlations should be attributed to particles both in front of and behind the central one. As with propagating longitudinal modes, they are strongly dependent on the softness of the potential core. Some characteristic features of the velocity correlation functions after the initial rise should be related to nonlongitudinal correlations. It has been shown that velocity cross-correlations between distinct particles cannot only be attributed to the direct interactions among particles, but also to the motions induced by the movement of a tagged particle on their neighbors.
publishDate 2000
dc.date.none.fl_str_mv 2000
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/2445/18885
url https://hdl.handle.net/2445/18885
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: http://dx.doi.org/10.1103/PhysRevE.62.532
Physical Review e, 2000, vol. 62, núm. , p. 532-537
http://dx.doi.org/10.1103/PhysRevE.62.532
dc.rights.none.fl_str_mv (c) American Physical Society, 2000
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Physical Society, 2000
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
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
_version_ 1869410654162518016
score 15.301603

Registos relacionados