We report the anisotropy of the proton momentum distribution in potassium hydrogen carbonate, KHCO3. Using the deep inelastic neutron scattering technique, the mean proton momenta along, and across, the O–H–O bond have been determined. While the momentum across the bond corresponds to a proton in a harmonic potential, that along the bond shows this potential is consistent with a previously proposed double well shape.
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Postorino et al. (1991) studied this question.
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