Site Symmetry in Permutation — Inversion Symmetry Groups of Nonrigid Crystals
A crystal is called nonrigid if some of its nuclei show motions relative to the crystal as a whole differing from small vibrations, for example, rotations, inversion motions, or large amplitude vibrations. There are a great number of such crystals [10.1]. For example, molecules in plastic crystals show free or hindered rotations. These rotations can be observed, for instance, in NMR spectra: one observes line narrowing when the molecules start to rotate.
KeywordsSymmetry Group Initial Configuration Semidirect Product Site Symmetry Invariant Subgroup
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- 10.1G.N. Parsonage, L.A. Stavely: Disorder in Crystals (Clarendon, Oxford 1978)Google Scholar
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