Modulated Structures CIF Dictionary version 1.0

_space_group_ssg_name_WJJ

Name

Category: space_group

Data type: char

Example: 'P:P c m n:s s -1'

Definition

    	
   Superspace group symbol as given by de Wolff, Janssen & Janner
   (1981). Valid only for one-dimensional modulated structures.
   The symbol is divided in three parts separated by a colon ':': 
   The superspace lattice symbol, the Hermann-Mauguin space group 
   symbol of the reference structure, 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 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: de Wolff, P. M., Janssen, T. & Janner, A. (1981).
        Acta Cryst. A37, 625-636