PPT Slide
Scaling as a function of Secondary beam direction
This largely an absorption correction. It is particularly useful at long wavelengths (including CuKa)
The same surface should be used for different runs from the same crystal, but for different wavelengths (“datasets”) it is better to use different surfaces
In Scala: scales secondary 6
tie surface 0.001 # restrained to sphere
link surface all # same surface for all runs
This correction seems to be reasonably robust (with the restraint) and is recommended (especially in high-symmetry spacegroups)