Modulated Structures CIF Dictionary version 1.0

_space_group_symop_ssg_operation_algebraic

Name

Category: space_group_symop

Data type: char

Must appear in a looped list containing '_space_group_symop_ssg_id'

Example: 'x1,-x2,x3,1/2+x4'

Definition

    	
   A parsable string giving one of the symmetry operations of the
   superspace group in algebraic form. This data will generally be 
   repeated in a loop. Use symbols as necessary according to 
   _cell_modulation_dimension.
   All symmetry operations should be entered, including the identity
   operation, those for lattice centring and a centre of symmetry, 
   if present. Symbolic notation for coordinates is expected to be 
   so that the identity is expressed as x1,x2,x3,...,xn.

   _space_group_symop_ssg_operation_algebraic must always be present
   in a CIF corresponding to a modulated structure.