http://www.cnr.it/ontology/cnr/individuo/prodotto/ID190870
Non-Gaussian self-dynamics of liquid hydrogen (Articolo in rivista)
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- Label
- Non-Gaussian self-dynamics of liquid hydrogen (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevB.84.140510 (literal)
- Alternative label
Milva Celli (1), Ubaldo Bafile (1), Daniele Colognesi (1), Alessio De Francesco (2), Ferdinando Formisano (2), Eleonora Guarini (3), Martin Neumann (4), and Marco Zoppi (1) (2011)
Non-Gaussian self-dynamics of liquid hydrogen
in Physical review. B, Rapid communications (print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Milva Celli (1), Ubaldo Bafile (1), Daniele Colognesi (1), Alessio De Francesco (2), Ferdinando Formisano (2), Eleonora Guarini (3), Martin Neumann (4), and Marco Zoppi (1) (literal)
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- ISI Web of Science (WOS) (literal)
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- (1) Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy
(2) Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali, Operative Group in Grenoble (OGG), c/o Institut Laue-Langevin, 6 rue
J. Horowitz, B^oite Postal 156, F-38042, Grenoble Cedex 9, France
(3) Dipartimento di Fisica e Astronomia, Universit`a di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy
(4) Fakult¨at f¨ur Physik der Universit¨at Wien, Strudlhofgasse 4, A-1090 Wien, Austria (literal)
- Titolo
- Non-Gaussian self-dynamics of liquid hydrogen (literal)
- Abstract
- liquids. In the GA framework it is assumed that the motion of particles is only determined by the time
The Gaussian approximation (GA) is widely employed in the description of single-molecule dynamics inautocorrelation function of the particle velocity, in the whole wave-vector Q range of time- and space-dependent diffusive dynamics. Although often adopted, the validity of GA is not yet well assessed in different Q ranges, especially for the so-called quantum Boltzmann fluids. Liquid hydrogen, the most relevant test case for quantum dynamics simulation techniques, is also the canonical choice for experiments in self-dynamics, thanks to its ideal suitability to inelastic incoherent neutron scattering studies. Experimental evidence of the GA breakdown in hydrogen was recently achieved, but, to the best of our knowledge, the localization in Q space of non-Gaussian behavior was still undetermined, and no quantitative assessment has been obtained yet. These issues have been tackled and solved by a recent neutron investigation in conjunction with a quantum simulation of the velocity autocorrelation function. (literal)
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