The inelastic scattering of cold neutrons by liquid and solid HF has been used to study the lowhyphen;frequency modes of motion. On melting a pronounced reduction in amplitude and increase in width is observed in the nearhyphen;inelastic spectra. Analysis of the angular dependence of this effect suggests that it is due to rotational rather than translational modes of motion. In this event the rotational diffusion constant is ap;thinsp;1thinsp;times;thinsp;1012secminus;1. Additional evidence is given to support the idea of hydrogenhyphen;bonded polymers in the liquid state of HF.
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