DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary |
Draft version 1.5 for comment |
Definition:
Beam crossfire correlation degrees^2^ between the crossfire laboratory X-axis component and the crossfire laboratory Y-axis component (see AXIS category). This is a characteristic of the X-ray beam as it illuminates the sample (or specimen) after all monochromation and collimation. This is the mean of the products of the deviations of the direction of each photon in XZ plane times the deviations of the direction of the same photon in the YZ plane around the mean source beam direction. This will be zero for uncorrelated crossfire. Note that some synchrotrons, this value is specified in milliradians^2^, in which case a conversion would be needed. To go from a value in milliradians^2^ to a value in degrees^2^, multiply by 0.180^2^ and divide by \p^2^.
Type: float
Mandatory item: no
Category: diffrn_radiation
Copyright © 2005 International Union of Crystallography