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International
Tables for Crystallography Volume G Definition and exchange of crystallographic data Edited by J. R. Hester and B. McMahon © International Union of Crystallography 2026 |
International Tables for Crystallography (2026). Vol. G. Early view chapter
https://doi.org/10.1107/97809553602060001011 Chapter 4.2 Core dictionary (coreCIF) |
Core dictionary version 3.3.0
Category GEOM
Name:'GEOM'
Parent category:
MODEL
Definition:
Data items in the GEOM category describe aspects of the overall geometry
of the structural model as derived from the atomic sites.
The detailed geometry is expressed in terms of the interatomic
angles (GEOM_ANGLE data), covalent bond distances
(GEOM_BOND data), contact distances (GEOM_CONTACT data),
hydrogen bonds (GEOM_HBOND data) and torsion geometry
(GEOM_TORSION data).
Geometry data are usually redundant, in that they can be
calculated from other more fundamental quantities in the data
block. However, they serve the dual purposes of providing a
check on the correctness of both sets of data and of enabling
the most important geometric data to be identified for
publication by setting the appropriate publication flag.
Category is of type Set
This category contains the following items