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Designing the twinning dictionary

jamesrhester edited this page Jan 17, 2013 · 3 revisions

Requirements

The CIF twinning dictionary should provide a set of standard data tags so that single-crystal workers can express their treatment of twinning in a verifiable way. It must mesh with current CIF dictionaries maintained by the IUCr.

The extra tags should allow us to:

  • Describe the type of twinning, using classification schemes from the literature
  • Mathematically describe the relationship between the twin individuals
  • Identify the twin individuals contributing to each observed peak
  • List the calculated and observed structure factors for each observed peak

Development

The master branch contains a version that has been agreed upon by all workers. The 'proposed' branches contain various proposals for improvement. Justifications for these proposed improvements should be added and edited below.

Proposals

JRH proposals

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