Neutron scattering has been used to measure in ice I h both the coherent scattering (D 2 O ice) and the incoherent scattering (H 2 O 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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Sacchetti et al. (1982) studied this question.
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