Symmetry
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Dialog Box: Symmetry [Input menu]

This gives four options for specifying the symmetry. Note that you must also set the Lattice Translation flags for the three axes in the Title/Axes dialog.

Space Group. This is the normal option for a crystal or polymer, although the Custom option can also be used.

Point Group. This is the normal option for a molecule, if symmetry is used.

Custom Point or Space Group. This option uses symmetry operators in form of the general equipoint in the International Tables for X-ray Crystallography. This is used for certain import file formats, and for old VIBRAT files. It is not normally used for new input except in the case of a non-standard space group, for example C(bar)1.

Use No Symmetry. This sets the point group to C1 and the space group to P1 if necessary.