As was shown in Chapter 1, a crystal can be thought to be made up of a space lattice which is convoluted by the average motif of the repetitive structure. The parallelepiped that describes the vector repeat of this space lattice is the unit cell. It need not be right-angled and, indeed, in two-dimensional projection, it is readily seen that five types of planar space lattice are permitted, as illustrated in Figure 2.1. For organic electron crystallography, oblique and rectangular arrays are most important.
KeywordsPoint Group Reciprocal Lattice Mirror Plane Crystal Symmetry Multiplication Table
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