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Figure 16
Examples of a 2D powder diffraction pattern collected with a laboratory diffractometer, when the beam size is so large that the beam hits also the metal gasket. One can see the reflections from diamonds, ruby calibrant (points) and steel gasket (bold thick rings shown by red arrows) overlaying very weak rings originating from the poorly scattering powder sample (shown by blue arrows): (a) before masking, (b) after masking. The red mask is unambiguously justified. At least some of the point reflections of low intensity that were preliminarily masked (green) are located at rings and could potentially belong to a new phase that crystallizes under high-pressure conditions in the DAC. Therefore, their masking is not unambiguously justified; the origin of these reflections deserves further investigation.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 4| August 2025| Pages 1085-1105
https://doi.org/10.1107/S1600576725004728
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