Difference between revisions of "Centric and acentric distribution"
From Online Dictionary of Crystallography
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==Definition== | ==Definition== | ||
| − | Centric or acentric distribution usually refer to the X-ray diffracted intensity distribution. It is in general possible to distinguish between a centrosymmetric or a non-centrosymmetric space group by considering their intensity distribution. The figure below represents the | + | Centric or acentric distribution usually refer to the X-ray diffracted intensity distribution. It is in general possible to distinguish between a centrosymmetric or a non-centrosymmetric space group by considering their intensity distribution. The figure below represents the theoretical cumulative intensity curves for the acentric, centric and hypercentric-distributions as fraction of the means intensity |
[[File:Cumu.jpg|center]] | [[File:Cumu.jpg|center]] | ||
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| + | In practice, it is not always possible to clearly distinguish between a centric and an acentric distribution. This is specifically the case for inorganic material with highly symmetric structures. | ||
== See also == | == See also == | ||
Wilson, A. J. C. (1949). The probability distribution of X-ray intensities. Acta Cryst. 2, 318-321. | Wilson, A. J. C. (1949). The probability distribution of X-ray intensities. Acta Cryst. 2, 318-321. | ||
Revision as of 09:15, 22 February 2026
Definition
Centric or acentric distribution usually refer to the X-ray diffracted intensity distribution. It is in general possible to distinguish between a centrosymmetric or a non-centrosymmetric space group by considering their intensity distribution. The figure below represents the theoretical cumulative intensity curves for the acentric, centric and hypercentric-distributions as fraction of the means intensity
In practice, it is not always possible to clearly distinguish between a centric and an acentric distribution. This is specifically the case for inorganic material with highly symmetric structures.
See also
Wilson, A. J. C. (1949). The probability distribution of X-ray intensities. Acta Cryst. 2, 318-321.