Titlebook: Site Symmetry in Crystals; Theory and Applicati Robert A. Evarestov,Vyacheslav P. Smirnov Book 19931st edition Springer-Verlag Berlin Heide

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Symmetry Groups and Their Representations,oups for molecules, and space groups for crystals. All these groups are subgroups of the same continuous group: the Euclidean group. In the following sections we give, briefly, the most important information about these groups. Special attention is paid to site symmetry of physical systems related t

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Application of Induced Representations in the Electron Theory of Molecules and Crystals, crystalline orbitals in complex crystals, despite the many atoms in a unit cell, and also to draw some qualitative conclusions about the character of chemical bonding, provided the symmetry properties of the electron states in the upper valence bands are known.

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Application of Induced Representations of Space Group to Second Order Phase Transitions,ions [7.1, 2] and have been systematically applied to a large number of systems [7.3]. The Landau theory of continuous phase transitions is the basis of this symmetry analysis [7.1]. Symmetry rules used in the Landau theory are briefly reviewed in the next section.

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,Site Symmetry in Permutation — Inversion Symmetry Groups of Nonrigid Crystals,ions, 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