Modulated Structures CIF Dictionary version 1.0

_space_group_ssg_name_IT

Name

Category: space_group

Data type: char

Example: 'P n m a (0 0 \g) 0 s 0'

Definition

    	
   Superspace group symbol as supplied in International Tables for
   Crystallography, Vol. C. Valid only for one-dimensional
   modulated structures. The symbol is divided in 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, bars as 
   negative signs. The components of the modulation wave vector (in
   parenthesis) 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, Vol. C,
        First edition (1992) pp. 797-835
   or:  International Tables for Crystallography, Vol. C,
        Second edition (1999) pp. 899-937