Definition:
Superspace-group symbol as given in International Tables for Crystallography, Vol. C (2004). Valid only for one-dimensional modulated structures. The symbol is divided into three parts: the Hermann-Mauguin space-group symbol of the reference structure, the modulation wave vector and the phase shift (or internal translation) associated with each component of the space group. Each component of the space-group name is separated by a space. Subscripts should appear without special symbols and bars should be given as negative signs. The components of the modulation wave vector (in parentheses) and the phase shifts are also separated by a space. For composites described in a single data block, the superspace group describes the symmetry of the whole structure. The symmetry of each subsystem can be derived using the appropriate W matrices. Ref: International Tables for Crystallography (2004). Vol. C, Chapter 9.8. Dordrecht: Kluwer Academic Publishers.Example:
'P n m a (0 0 \g) 0 s 0' |
Type: char
Category: space_group
Copyright © 2005 International Union of Crystallography