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. 3.3, pp. 126-127
Section 3.3.8.3. Multiple detectors
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NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA |
At present, CIF does not offer the ability to construct true multi-dimensional data structures. However, many instruments with multiple detectors produce reasonably tractable numbers of data points. For such instruments, it is possible to include an additional data item, _pd_meas_detector_id, in the loop with the data to indicate the detector that made the observation.
In Example 3.3.8.3, four detectors placed 20° apart are referenced with arbitrarily chosen labels A, B, C and D. Note that the detector characteristics will typically be specified in a separate calibration loop containing terms such as _pd_calib_detector_id, _pd_calib_detector_response and _pd_calib_2theta_offset. The labels given for _pd_calib_detector_id should match those in _pd_meas_detector_id.