Hydrogen distribution in ice Ih

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Abstract
Neutron scattering has been used to measure in ice Ih both the coherent scattering (D2O ice) and the incoherent scattering (H2O ice) in order to examine the nature of the disorder of the hydrogen in this system. The incoherent scattering has proved to be essentially elastic within experimental accuracy and to be Q-dependent after correction for the temperature factor. The coherent diffraction has shown the presence of a substantial contribution of Q-dependent diffuse scattering. Interpretation of the results of these determinations indicates that the hydrogen (or deuterium) atoms are in well defined positions along the H-bonds, that is the wavefunction is localised on one of the two possible sites along the bond. Moreover at low temperature tunnelling occurs to the other equilibrium position along the H-bond.

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