OBSERVATION BY NEUTRON INCOHERENT INELASTIC SPECTROSCOPY OF SPLIT HIGHER HARMONICS OF THE AMMONIUM ION LIBRATIONAL MODE IN THE CUBIC PHASE OF NH4BR
- This paper deals with high-resolution neutron scattering studies of the librational mode v6 (0 → 1) and its higher overtones for NH+4 in the ordered cubic phase of ammonium bromide, NH4Br. Experiments were conducted on the time-focused crystal analyser (TFXA) spectrometer of the UK spallation neutron source, ISIS. v6 (0 → 2) and v6 (0 → 3) show distinct splittings of ≈ 5 meV, the results are compared with optical data and a theoretical model. © 1986.
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