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Non-crystallographic Symmetry Interactions

      If strict non-crystallographic symmetry is imposed, the crystal symmetry interactions cannot be computed because of nonequivalent environments (see Chapter 16). Instead, only the interaction between non-crystallographically related molecules is computed using the and functional forms, i.e.,

The atom/group search and the update of the interaction list are carried out analogously to the intramolecular case. (Refer to Chapter 16 for the definition of non-crystallographic symmetry operators.)

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