Neutron incoherent scattering study of NH3 low-energy transitions in hexammine compounds II

Abstract This paper presents a search for tunnel transitions of NH 3 groups in Co(NH 3 ) 6 I 2 above the phase transition at which classical rotation, i.e. hopping over barrier to rotation, starts. It was possible to detect two broad satellites of the elastic line in the neutron scattering pattern, which provided the tunnel transition energy. This energy decreases when approaching the phase transition on cooling, thus showing a soft-mode type of behaviour.