X-ray-Raman scattering from the oxygen K edge in liquid and solid H2O

Inelastic x-ray scattering from oxygen Is electrons in liquid and solid wat er were recorded up to 200 eV above the onset of the O K edge. The-partial radial distribution function that characterizes the local environment of ox ygen in the water/ice system was determined. Good agreement is found betwee n the resulting partial distribution function for liquid water and that obt ained from elastic neutron scattering. In the near-edge region distinct dif ferences between the solid and liquid states are observed which arise form differences in the local structural and electronic environment of the oxyge n atoms. The method thus promises a degree of insight into details of hydro gen bonding interactions.