High-frequency dynamics of liquid and supercritical water (Articolo in rivista)

Type
Label
  • High-frequency dynamics of liquid and supercritical water (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Bencivenga, F; Cunsolo, A; Krisch, M; Monaco, G; Ruocco, G; Sette, F (2007)
    High-frequency dynamics of liquid and supercritical water
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bencivenga, F; Cunsolo, A; Krisch, M; Monaco, G; Ruocco, G; Sette, F (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 75 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Sincrotrone Trieste, I-34012 Trieste, Italy; CNR, CRS, SOFT, INFM,Operat Grp Grenoble, F-38043 Grenoble, France; European Synchrotron Radiat Facil, F-38043 Grenoble, France; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Univ Roma La Sapienza, CNR, INFM, SOFT,CRS, I-00185 Rome, Italy (literal)
Titolo
  • High-frequency dynamics of liquid and supercritical water (literal)
Abstract
  • The dynamic structure factor S(Q,omega) of water has been determined by high-resolution inelastic x-ray scattering (IXS) in a momentum (Q) and energy (E) transfer range extending from 2 to 4 nm(-1) and from +/- 40 meV. IXS spectra have been recorded along an isobaric path (400 bar) in a temperature (T) interval ranging from ambient up to supercritical (T > 647 K) conditions. The experimental data have been described in the frame of the generalized hydrodynamic theory, utilizing a model based on the memory function approach. This model allows identifying the active relaxation processes which affect the time decay of density fluctuations, as well as a direct determination of the Q, T, and density (rho) dependencies of the involved transport parameters. The experimental spectra are well described by considering three different relaxation processes: the thermal, the structural, and the instantaneous one. On approaching supercritical conditions, we observe that the microscopic mechanism responsible for the structural relaxation is no longer related to the making and breaking of intermolecular bonds, but to binary intermolecular collisions. (literal)
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