Electronic Resource
[S.l.]
:
International Union of Crystallography (IUCr)
Acta crystallographica
35 (1979), S. 703-713
ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
Symmetry coordinates are useful for describing nuclear arrangements of molecules that can be regarded as being distorted versions of more symmetrical reference structures. The symmetry coordinate description provides a basis for analysing how displacements along particular subsets of symmetry coordinates destroy certain symmetry elements of the reference structure but preserve others (kernel and co-kernel symmetries). It also helps in visualising the symmetry properties of special subspaces of the (3N-- 6)-dimensional internal coordinate space. Some problems concerning the choice of the reference point group are mentioned. It is shown that the symmetry properties of molecules possessing N cyclic degrees of freedom (e.g. torsion angles) are conveniently described in terms of N-dimensional space groups.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739479001686
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