title: Correlation of hydrogen bond lengths and angles in liquid water based on Compton scattering.
abstract: The temperature-dependent hydrogen-bond geometry in liquid water is studied by x-ray Compton scattering using synchrotron radiation combined with density functional theory analysis. Systematic changes, related to the weakening of hydrogen bonding, are observed in the shape of the Compton profile upon increasing the temperature. Using model calculations and published distribution functions of hydrogen-bond geometries obtained from a NMR study we find a significant correlation between the hydrogen-bond length and angle. This imposes a new constraint on the possible local structure distributions in liquid water. In particular, the angular distortions of the short hydrogen bonds are significantly restricted.
authors.affiliation: Division of X-ray Physics, Department of Physical Sciences, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland. mikko.o.hakala@helsinki.fi
authors.forename: M
authors.initials: M
authors.lastname: Hakala
authors.forename: K
authors.initials: K
authors.lastname: Nygård
authors.forename: S
authors.initials: S
authors.lastname: Manninen
authors.forename: S
authors.initials: S
authors.lastname: Huotari
authors.forename: T
authors.initials: T
authors.lastname: Buslaps
authors.forename: A
authors.initials: A
authors.lastname: Nilsson
authors.forename: L G M
authors.initials: LG
authors.lastname: Pettersson
authors.forename: K
authors.initials: K
authors.lastname: Hämäläinen