Quasielastic neutron scattering investigation of motional processes associated with two dynamic hydrogen populations in the bronze H1.68MoO3
作者： Robert C.T. Slade , Paul R. Hirst , Barbara C. West , Richard C. Ward , Andreas Magerl
DOI: 10.1016/0009-2614(89)85330-8
关键词: Quasielastic scattering 、 Elastic scattering 、 Quasielastic neutron scattering 、 Molecular physics 、 Molecule 、 Crystallography 、 Chemistry 、 Elastic energy 、 Hydrogen 、 Small-angle neutron scattering 、 Population
摘要: Abstract Variable-temperature incoherent quasielastic neutron scattering (QENS) measurements on instruments of differing elastic energy resolutions and ranges vector magnitude allow characterisation two (slowly exchanging) dynamic hydrogen populations in the interlayer region H 1.68 MoO 3 motional processes associated with them. One population (present hydroxyl groups) undergoes rapid self-diffusion ( D t (295 K)=4×10 −6 cm 2 s −1 ). The second (in coordinated O molecules) has a higher activation barrier to H-atom takes part fourfold reorientational motion E A =26 kJ mol , τ res 0 ≈10 −14 s).
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