Diffusion studies using quasi-elastic neutron scattering

摘要: Quasi-elastic neutron scattering allows to study molecular diffusion in condensed or adsorbed phases. Diffusion coefficients can be derived, without a model, over space scales where motion follows Fick’s law. Furthermore, using jump models, one determine characteristic times and distances for the elementary jumps. For isotropic diffusion, existing models are discussed new which takes into account delocalisation of molecule on its site, is proposed. The cases normal one-dimensional single-file examined. Applications technique reviewed here concern mainly molecules zeolites, some results obtained microporous silica also presented