High frequency collective dynamics in liquid potassium (Articolo in rivista)

Type
Label
  • High frequency collective dynamics in liquid potassium (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Monaco, A; Scopigno, T; Benassi, P; Giugni, A; Monaco, G; Nardone, M; Ruocco, G; SaEapoll, M (2007)
    High frequency collective dynamics in liquid potassium
    in Journal of non-crystalline solids
    (literal)
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  • Monaco, A; Scopigno, T; Benassi, P; Giugni, A; Monaco, G; Nardone, M; Ruocco, G; SaEapoll, M (literal)
Pagina inizio
  • 3154 (literal)
Pagina fine
  • 3159 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 353 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • European Synchrotron Radiat Facil, F-38043 Grenoble, France; Univ Roma La Sapienza, INFM, Dept Fis, I-00185 Rome, Italy; Univ Aquila, INFM, Dept Fis, I-67010 Laquila, Italy; Univ Florence, INFM, Dept Energy, I-50019 Florence, Italy (literal)
Titolo
  • High frequency collective dynamics in liquid potassium (literal)
Abstract
  • We investigated by inelastic X-ray scattering the dynamical properties of molten potassium in a wide range of momentum transfer, Q, from 1 nm(-1) up to the main peak of the structure factor Q approximate to 17 nm(-1). The observed increase of sound velocity in the low Q region (1 < Q < 3 nm(-1)), has been described within a model characterized by two distinct relaxation processes for the collective dynamics. The obtained results are discussed and compared with those from previous neutron scattering experiments. In particular, we associate the speed-up of the sound velocity to the 'instantaneous' disorder of the liquid as opposed to the argument, supported by some neutron scattering studies, of a transition from a liquid to solid like response of the system. (c) 2007 Elsevier B.V. All rights reserved. (literal)
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