Microscopic collective dynamics in liquid para-H-2

Authors
Bermejo, FJ Fak, B Bennington, SM Fernandez-Perea, R Cabrillo, C Dawidowski, J Fernandez-Diaz, MT Verkerk, P
Citation
Fj. Bermejo et al., Microscopic collective dynamics in liquid para-H-2, PHYS REV B, 60(22), 1999, pp. 15154-15162
Citations number
30
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
01631829 → ACNP
Volume
60
Issue
22
Year of publication
1999
Pages
15154 - 15162
Database
ISI
SICI code
0163-1829(199912)60:22<15154:MCDILP>2.0.ZU;2-Z
Abstract
Well-defined phonons with strong anomalous (upward) dispersion are observed by inelastic neutron scattering in liquid para-H-2 at a temperature of 15. 7 K. The damping, being very small for the low-e phonons, increases with wa ve vector Q, and only broad features are observed for Q greater than or sim ilar to 1 Angstrom(-1). This behavior is shown to deviate strongly from res ults of molecular simulations of a fully classical analogue using a realist ic potential. [S0163-1829(99)01245-X].