International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by Th. Hahn

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. A. ch. 2.2, p. 17

Section 2.2.1. General layout

Th. Hahna* and A. Looijenga-Vosb‡

a Institut für Kristallographie, Rheinisch-Westfälische Technische Hochschule, Aachen, Germany, and bLaboratorium voor Chemische Fysica, Rijksuniversiteit Groningen, The Netherlands
Correspondence e-mail:  hahn@xtl.rwth-aachen.de

2.2.1. General layout

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The presentation of the plane-group and space-group data in Parts 6[link] and 7[link] follows the style of the previous editions of International Tables. The entries for a space group are printed on two facing pages as shown below; an example (Cmm2, No. 35) is provided inside the front and back covers . Deviations from this standard sequence (mainly for cubic space groups) are indicated on the relevant pages.

Left-hand page:
(1) Headline
(2) Diagrams for the symmetry elements and the general position (for graphical symbols of symmetry elements see Chapter 1.4[link] )
(3) Origin
(4) Asymmetric unit
(5) Symmetry operations
   
Right-hand page:
(6) Headline in abbreviated form
(7) Generators selected ; this information is the basis for the order of the entries under Symmetry operations and Positions
(8) General and special Positions, with the following columns:
  Multiplicity
  Wyckoff letter
  Site symmetry , given by the oriented site-symmetry symbol
  Coordinates
  Reflection conditions
  Note: In a few space groups, two special positions with the same reflection conditions are printed on the same line
(9) Symmetry of special projections (not given for plane groups)
(10) Maximal non-isomorphic subgroups
(11) Maximal isomorphic subgroups of lowest index
(12) Minimal non-isomorphic supergroups

Note: Symbols for Lattice complexes of the plane groups and space groups are given in Tables 14.2.3.1[link] and 14.2.3.2[link] . Normalizers of space groups are listed in Part 15[link] .








































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