Abstract
Similar to many carboxylic acids, potassium bicarbonate KHCO 3 forms centrosymmetric, hydrogen bonded dimers in the crystalline state. Incoherent neutron scattering has been used for the determination of the effective double minimum potential (DMP) which governs the concerted two-proton jump. The influence of the acoustic instability at T c ≌ 320 K is found to be reflected in a critical variation of the asymmetry of the DMP. A staggered fluctuation of the dimer orientation strongly coupled to the hydrogen transfer is suggested as the primary order parameter.
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