Brillouin neutron scattering in heavy water: Evidence for two-mode collective dynamics (Articolo in rivista)

Type
Label
  • Brillouin neutron scattering in heavy water: Evidence for two-mode collective dynamics (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevE.69.061203 (literal)
Alternative label
  • Sacchetti F; Suck JB; Petrillo C; Dorner B (2004)
    Brillouin neutron scattering in heavy water: Evidence for two-mode collective dynamics
    in Physical review. E, Statistical, nonlinear, and soft matter physics (Print); The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Sacchetti F; Suck JB; Petrillo C; Dorner B (literal)
Pagina inizio
  • 061203-1 (literal)
Pagina fine
  • 061203-11 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 69 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Fisica, Università di Perugia Physics Department, Chemnitz University Dipartimento di Fisica, Università di Perugia Institut Laue Lagevin, Grenoble (literal)
Titolo
  • Brillouin neutron scattering in heavy water: Evidence for two-mode collective dynamics (literal)
Abstract
  • A high resolution s1.5 meVd inelastic neutron scattering experiment was carried out, aiming at an accurate investigation of the high frequency and low momentum dynamic response in heavy water. The experimental data confirm the existence of a dispersionless mode, besides the ordinary longitudinal collective dynamics. A simplified model, based on the interaction of two vibrational branches, is proposed to interpret the observed features of the dynamic spectra. The validity extent of this scheme is proved by applying it to room temperature neutron and x-ray data, to temperature and pressure dependent x-ray data, and to room temperature neutron data of vibrational density of states. The overall successfull results provided by this model, in conjunction with the combined analysis of the x-ray and neutron data on collective dynamics, enable a deeper insight into the complex mechanisms of the water dynamics and provide a simple phenomenological explanation for the transition from ordinary to fast sound. (literal)
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