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Titolo:
Density dependence of mean kinetic energy in liquid and solid hydrogen at 19.3 K
Autore:
Zoppi, M; Colognesi, D; Celli, M;
Indirizzi:
CNR, Ist Elettron Quantist, I-50127 Florence, Italy CNR Florence Italy I-50127 st Elettron Quantist, I-50127 Florence, Italy CNR, Grp Nazl Struttura Mat, I-00185 Rome, Italy CNR Rome Italy I-00185CNR, Grp Nazl Struttura Mat, I-00185 Rome, Italy
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL B
fascicolo: 2, volume: 23, anno: 2001,
pagine: 171 - 178
SICI:
1434-6028(200109)23:2<171:DDOMKE>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
INELASTIC NEUTRON-SCATTERING; MOMENTUM DISTRIBUTION; T=6.1 K; HE-4; PARAHYDROGEN; FLUID; SIMULATIONS; EVOLUTION; PHASE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Zoppi, M CNR, Ist Elettron Quantist, Via Panciatichi 56-30, I-50127 Florence, Italy CNR Via Panciatichi 56-30 Florence Italy I-50127 Florence, Italy
Citazione:
M. Zoppi et al., "Density dependence of mean kinetic energy in liquid and solid hydrogen at 19.3 K", EUR PHY J B, 23(2), 2001, pp. 171-178

Abstract

We have measured, using the TOSCA spectrometer at ISIS, the inelastic incoherent neutron scattering spectrum of liquid and solid para-hydrogen along the T = 19.3 K isotherm. From the high-energy region of the spectrum, wherethe Impulse Approximation for the Centre of Mass motion applies, we have been able to extract the mean translational kinetic energy, which, as expected, turns out rather different from the classical value and density dependent. We find that the density behaviours in the liquid and the solid phase are slightly different. This confirms a similar feature already observed illliquid and solid helium at T = 6.1 K [M. Celli, Al. Zoppi, J. Mayers, Phys. Rev. B 58, 242 (1998)]. The spectra from the solid phase have been also analysed in the low-energy region and allowed us to derive the Debye-Waller factor of solid para-hydrogen as a function of density. The comparison withthe available experimental data in the literature is rather good and confirms the excellent performances of TOSCA in the spectroscopic analysis of the condensed phases of para-hydrogen.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 04:59:35