spec

Software for Diffraction

3.9.4. - Special Reciprocal Space Scans



klradial angle start_radius finish_radius intervals time [H=expr]
hlradial angle start_radius finish_radius intervals time [K=expr]
hkradial angle start_radius finish_radius intervals time [L=expr]

klcircle radius start_angle finish_angle intervals time [H=expr]
hlcircle radius start_angle finish_angle intervals time [K=expr]
hkcircle radius start_angle finish_angle intervals time [L=expr]


The first three scans trace a path that would form a radial cut if projected on to the K-L, H-L or H-K planes at the specified angle in degrees from the positive K, H or H axes, respectively. start_radius and finish_radius specify the radial distance from the origin. The unscanned coordinate will be reevaluated at each point according to the optional expression in the last argument, which can be a function of the other coordinates, for example, H=L/300. Otherwise, the unscanned coordinate will remain constant.

The second three scans differ only in that they trace out a circular arc in the projected plane at the radius given by the first argument. start_angle and finish_angle are the endpoints in degrees of the arc of the scan.