International
Tables for Crystallography Volume G Definition and exchange of crystallographic data Edited by S. R. Hall and B. McMahon © International Union of Crystallography 2006 |
International Tables for Crystallography (2006). Vol. G. ch. 3.7, pp. 203-204
Section 3.7.4.3. Apparatus and instrumentation at the crystal
a
Department of Mathematics and Computer Science, Kramer Science Center, Dowling College, Idle Hour Blvd, Oakdale, NY 11769, USA |
Data items in these categories are as follows:
The bullet () indicates a category key. The arrow (
) is a reference to a parent data item. Items in italics are defined in the mmCIF dictionary.
The DIFFRN_MEASUREMENT category is defined in the mmCIF dictionary (Section 3.6.5.2
; see the detailed discussion in Section 3.2.2.2.3
). The CBF/imgCIF dictionary restates the DIFFRN_MEASUREMENT category, adding new tags. Data items in the DIFFRN_MEASUREMENT category record details about the device used to orient and/or position the crystal during data measurement and the manner in which the diffraction data were measured. To allow for multiple measurement devices, _diffrn_measurement.id has been added to the category key. The number of axes is given by the value of _diffrn_measurement.number_of_axes. The axes should be described using entries in DIFFRN_MEASUREMENT_AXIS.
Data items in the DIFFRN_MEASUREMENT_AXIS category associate axes with goniometers, just as data items in the DIFFRN_DETECTOR_AXIS category associate axes with detectors.