Molecular dynamics study by the neutron inelastic scattering method : IV. Ammonium metavanadate

The dynamics of the ammonium ion in NH ₄VO ₃ at room temperature was studied by the inelastic neutron scattering method. The spectrum obtained shows that the ammonium ions in NH ₄VO ₃ perform torsional oscillations with frequencies 371 and (probably) 308 cm ^-1. Using the above frequencies the barrier height for rotations was evaluated as equal to 4.7 and 3.5 kcal/mole.