Pressure evolution of the high-frequency sound velocity in liquid water.
The high-frequency sound velocity v( infinity ) of liquid water has been determined to densities of 1.37 g/cm(3) by inelastic x-ray scattering. In comparison to the hydrodynamic sound velocity v(0), the increase of v( infinity ) with density is substantially less pronounced, indicating that, at high density, the hydrogen-bond network is decreasingly relevant to the physical properties of liquid water. Furthermore, we observe an anomaly in v( infinity ) at densities around 1.12 g/cm(3), contrasting the smooth density evolution of v(0).
Krisch
M
M
European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble, Cedex France.
Loubeyre
P
P
Ruocco
G
G
Sette
F
F
Cunsolo
A
A
D'Astuto
M
M
LeToullec
R
R
Lorenzen
M
M
Mermet
A
A
Monaco
G
G
Verbeni
R
R