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Croatian Association of Crystallographers

*****

Bijenička c. 54

HR-10000 Zagreb

Croatia

Non-merohedral Twins (Lecture and Tutorial)

In contrast to twinning by merohedry the reciprocal lattices of the different domains of non-merohedral twins do not overlap exactly. So only part of the reflections are affected by the twinning. This will often become apparent during data collection. If both twin domains are similar in size, there are often problems with the cell determinations and usual automatic indexing programs fail. The next problem is integration and scaling of such data sets. Solving and refining is normally easier for non-merohedral twins compared to merohedral ones.

The main principles of data processing will be presented. There will be the possibility to go through a real example, but as the needed software is supplied by the diffractometer vendors, this will be producer specific.

The workshop is generously supported by:

Ministry of Science, Education and Sports of the Republic of Croatia

International Union of Crystallography

European Crystallographic Association

www.rofa.at