COLLECTIVE DYNAMICS IN WATER BY HIGH-ENERGY RESOLUTION INELASTIC X-RAY-SCATTERING

Authors
SETTE F RUOCCO G KRISCH M BERGMANN U MASCIOVECCHIO C MAZZACURATI V SIGNORELLI G VERBENI R
Citation
F. Sette et al., COLLECTIVE DYNAMICS IN WATER BY HIGH-ENERGY RESOLUTION INELASTIC X-RAY-SCATTERING, Physical review letters, 75(5), 1995, pp. 850-853
Citations number
19
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
75
Issue
5
Year of publication
1995
Pages
850 - 853
Database
ISI
SICI code
0031-9007(1995)75:5<850:CDIWBH>2.0.ZU;2-P
Abstract
A propagating excitation with a velocity of sound of 3200 +/- 100 m/s is measured in H2O at 294 K between 4 and 14 nm(-1), using inelastic x -ray scattering with 5 meV energy resolution. The existence of fast so und is therefore demonstrated in an energy-momentum region much wider than that of previous neutron measurements on D2O. The equivalence of the fast sound velocity in H2O and in D2O rules out models where this mode propagates only on the hydrogen network. These results show the a bility of inelastic x-ray scattering to study the collective dynamics of liquids.