http://www.cnr.it/ontology/cnr/individuo/prodotto/ID190880

Neutron study of non-Gaussian self dynamics in liquid parahydrogen (Articolo in rivista)

Type

Label

Neutron study of non-Gaussian self dynamics in liquid parahydrogen (Articolo in rivista) (literal)

Anno

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Alternative label

Ubaldo Bafile (1), Milva Celli (1), Daniele Colognesi (1), Marco Zoppi (1), Eleonora Guarini (2), Alessio De Francesco (3), Ferdinando Formisano (3), Martin Neumann (4) (2012)
Neutron study of non-Gaussian self dynamics in liquid parahydrogen
in Journal of physics. Conference series (Print)
(literal)

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Ubaldo Bafile (1), Milva Celli (1), Daniele Colognesi (1), Marco Zoppi (1), Eleonora Guarini (2), Alessio De Francesco (3), Ferdinando Formisano (3), Martin Neumann (4) (literal)

Pagina inizio

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5th European Conference on Neutron Scattering (ECNS 2011), Prague, Czech Republic (17-21 July, 2011) (literal)

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Rivista

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Note

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(1) Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy (2) Dipartimento di Fisica e Astronomia, Universitµa di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy (3) Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali, Operative Group in Grenoble (OGG), c/o Institut Laue Langevin, 6 rue Jules Horowitz, BP 156 F-38042 Grenoble Cedex, France (4) FakultÄat fÄur Physik der UniversitÄat Wien, Strudlhofgasse 4, A-1090 Wien, Austria (literal)

Titolo

Abstract

A time-honoured approach to single-molecule, or self, dynamics of liquids is based on the so-called Gaussian approximation (GA), where it is assumed that, in the whole dynamical range between hydrodynamic di®usion and free-particle streaming, the motion of a particle is fully determined by a unique function of time directly related to the velocity autocorrelation function. An evident support to the GA is o®ered by the fact that the approximation becomes exact in both above limit conditions. Yet, experimental inquiries into the presence of non-Gaussian dynamics are very scarce, particularly in liquid parahydrogen in spite of its importance as the prototype of a \quantum Boltzmann liquid\" which has also served as a benchmark for the development of quantum dynamics simulation algorithms. Though experimental evidence of the breakdown of the GA was obtained by some of the authors a few years ago, the localization in Q space of non-Gaussian behaviour was still undetermined, and no quantitative assessment of the e®ect was ever obtained. These issues have been tackled and solved by a new neutron investigation, which provides the ¯rst determination of non-Gaussian behaviour in the framework of the well-known theoretical approach by Rahman, Singwi and SjÄolander. (literal)

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