Structures of high-density and low-density water

The three sire-sire 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) similar to 0.0295 molecules/Angstrom(3)), with an open, hydrogen-bonded tetrahedral structure, to a high-density form of water (rho(H) similar to 0.0402 molecules/Angstrom(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.