Structures of high-density and low-density water
The three site-site partial structure factors for water have been measured as a function of pressure, using neutron diffraction, at a temperature of 268 K. It is found that the measured structure functions imply a continuous transformation with increasing pressure from a low-density form of water ( rho(L) approximately 0.0295 molecules/A(3)), with an open, hydrogen-bonded tetrahedral structure, to a high-density form of water ( rho(H) approximately 0.0402 molecules/A(3)), with nontetrahedral O-O-O angles and a collapsed second coordination shell, which implies broken hydrogen bonds between the first and second coordination shells.
Soper
AK
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom.
Ricci
MA