[IUCr Home Page] [CIF Home Page]

Index

Symmetry dictionary (symCIF) version 1.0.1

_space_group_symop.operation_xyz

Name:
'_space_group_symop.operation_xyz'

Definition:

   A parsable string giving one of the symmetry operations of the
   space group in algebraic form.  If W is a matrix representation
   of the rotational part of the symmetry operation defined by the
   positions and signs of x, y and z, and w is a column of
   translations defined by the fractions, an equivalent position
   X' is generated from a given position X by the equation:

             X' = WX + w.

               (Note: X is used to represent the bold italic x in International
               Tables for Crystallography Volume A, Section 5.)

               When a list of symmetry operations is given, it is assumed
               that the list contains all the operations of the space
               group (including the identity operation) as given by the
               representatives of the general position in International
               Tables for Crystallography Volume A.

               Ref: International Tables for Crystallography (2002). Volume A,
       Space-group symmetry, edited by Th. Hahn, 5th. ed.
       Dordrecht: Kluwer Academic Publishers.

Example:

x,1/2-y,1/2+z c glide reflection through the plane (x,1/4,z)

Type: char

Mandatory item: no

Alias:
_symmetry_equiv_pos_as_xyz (cif_core.dic version 1.0)

Related item: _space_group_symop.generator_xyz (alternate)

Enumeration default: x,y,z

Category: space_group_symop