title: Structures of high-density and low-density water
abstract: 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.
authors.affiliation: ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom.
authors.initials: AK
authors.lastname: Soper
authors.initials: MA
authors.lastname: Ricci