Crystallographic Information Framework

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Restraints dictionary version 1.0

_restr_rigid_body_site_symmetry_

Name:
'_restr_rigid_body_site_symmetry'

Definition:

   The site symmetry of an atom in a rigid body.

   The symmetry code of each atom site is given as the 
	       symmetry-equivalent position number 'n' and the cell 
	       translation number 'klm'. These numbers are combined 
	       to form the code n_klm. The character string n_klm is 
	       composed as follows:

   n refers to the symmetry operation that is applied to the
   coordinates stored in _atom_site_fract_x, _atom_site_fract_y
   and _atom_site_fract_z. It must match the number given in
   _space_group_symop_id (formerly _symmetry_equiv_pos_site_id).

   k, l and m refer to the translations that are subsequently
   applied to the symmetry-transformed coordinates to generate
   the atom used in calculating the rigid body. These translations
   (x,y,z) are related to (k,l,m) by the relations
        k = 5 + x
        l = 5 + y
        m = 5 + z
   By adding 5 to the translations, the use of negative numbers
   is avoided.

Examples:

. no symmetry or translation applied
4 4th symmetry operation applied
7_645 7th symm. posn.; +1 on x; -1 on y

Appears in list containing _restr_rigid_body_id
Enumeration default: 1_555

Type: char

Category: restr_rigid_body