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Combination of two or three symmetry operators

Sy cluster, then I operator (Fig. 14.9) the I operator, located at a distance along the z axis perpendicular to the screw direction, generates centrosymmetric pairs of screw ribbons. The new structure can be optimized by rotation of the S ribbon as a whole around its own propagation axis. The c cell axis must be c = 4z° since the b cell axis was fixed during the Sy search, the new cluster is [Pg.387]

Unfortunately, there is no hope of systematizing these operations for all space groups and orientations of symmetry operators, so the computer code must contain a special section for each combination and desired space group. The most common and useful combinations of two symmetry operators are summarized in Table 14.5. A reader who cares to follow in detail all the manipulations shown in that table learns all there is to learn about the geometrical crystallography of organic compounds [10]. [Pg.388]


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