Observation by neutron incoherent inelastic spectroscopy of split higher harmonics of the ammonium ion librational mode in the cubic phase of NH4Br |
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| Affiliation: | 1. Key Laboratory of Meteorological Disaster, Ministry of Education (KLME) / Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD) / Joint International Research Laboratory of Climate and Environment Change (ILCEC) / Earth System Modeling Center (ESMC) / Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;3. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China;4. National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China;1. Earth System Modeling Center, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science & Technology, Nanjing, 210044, China;2. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing, 210044, China;3. International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI, 96822, USA |
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| Abstract: | ![]()
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. |
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