Abstract
The vibrations of the strong symmetric NHN hydrogen bond in H 3Co(CN) 6 have been investigated by inelastic neutron scattering spectroscopy at 80 K. The two deformation modes δ(NH) and γ(NH) have been identified. A strong protonic mode is observed in the low energy transfer region and is assigned to the antisymmetric stretching vibration of the hydrogen bond. Relative intensities of the ν(NH) fundamental, its first overtone and bending fundamentals are interpreted as suggesting a strongly anisotropic Debye-waller factor. At 5 K the ν(NH) fundamental shows a complex structure which is interpreted in terms of coupling with low frequency lattice modes.
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