Collective excitations in liquid CD4: Neutron scattering and molecular-dynamics simulations (Articolo in rivista)

Type
Label
  • Collective excitations in liquid CD4: Neutron scattering and molecular-dynamics simulations (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1209/epl/i2005-10322-9 (literal)
Alternative label
  • Guarini E. (1); Bafile U. (2); Barocchi F. (3,1); Demmel F. (4); Formisano F. (5); Sampoli M. (6,1); Venturi G. (3,1) (2005)
    Collective excitations in liquid CD4: Neutron scattering and molecular-dynamics simulations
    in Europhysics letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Guarini E. (1); Bafile U. (2); Barocchi F. (3,1); Demmel F. (4); Formisano F. (5); Sampoli M. (6,1); Venturi G. (3,1) (literal)
Pagina inizio
  • 969 (literal)
Pagina fine
  • 975 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 72 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) CNR-INFM and CRS Soft, c/o Dipartimento di Fisica, Università di Firenze I-50019 Sesto Fiorentino, Italy 2) CNR-ISC, Sezione di Firenze - I-50019 Sesto Fiorentino, Italy 3) Dipartimento di Fisica, Università di Firenze - I-50019 Sesto Fiorentino, Italy 4) ISIS Facility, Rutherford Appleton Laboratory - Chilton, Oxfordshire, OX11 0QX, UK 5) CNR-INFM and CRS Soft, c/o Institut Laue Langevin - BP 156, Grenoble, France 6) Dipartimento di Energetica, Università di Firenze - I-50139 Firenze, Italy (literal)
Titolo
  • Collective excitations in liquid CD4: Neutron scattering and molecular-dynamics simulations (literal)
Abstract
  • We have investigated the dynamic structure factor S(Q,omega) of liquid CD4 at T=97.7 K in the wave vector range 2 <= Q/nm(-1)<= 15 by means of neutron scattering and molecular-dynamics simulation, in order to study the centre-of-mass collective dynamics. The agreement between the experimental spectra and those simulated using a recent ab initio based intermolecular potential is good, particularly at low Q. Underdamped collective excitations, detected in the whole experimental Q-range, characterize the dynamics of liquid CD4 as markedly different from that of other molecular liquids. Also, the energy and damping of collective excitations in methane are shown to differ considerably, even at the lowest measured Q-values, from those of linearized hydrodynamic modes. An empirical relation, able to reconcile the different wave vector ranges of mode propagation observed in disparate liquids, is investigated. (literal)
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