The hindrance potential and coupling of the NH3 quantum rotors in Co(NH3)6(PF6)2

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Abstract
The first example of transitions between almost free rotational levels of NH3 groups in the solid state is shown by the inelastic neutron scattering spectrum of Co(NH3)6(PF6)2, and can be interpreted in terms of a very weak sixfold potential. Additional satellite peaks are visible around the 0→1 rotational feature at high spectral resolution and it is shown that the temperature dependence of these satellites demonstrates that they originate from a coupling between NH3 rotors.