Figure 4
The calculated intensity distribution in diffraction space for the monochromator as it is rocked in [omega] and 2[theta] (lower view). The peaks for the Cu K[alpha]1 and Cu K[alpha]2 lines are clear; the abrupt drop in intensity, peaks and intensity fluctuations at the low 2[theta] values are associated with scattering close to the grazing exit critical angle. For the experiments the monochromator is set in [omega] to the K[alpha]1 peak, and this gives the divergence profile as in the upper view. The calculation is performed in reciprocal space coordinates and then converted to diffraction space for the angular coordinates.  [article HTML]