Most of our powder diffractometers use the Bragg-Brentano parafocusing geometry.
- A point detector and sample are moved so that the detector is always at 2q and the sample surface is always at q to the incident X-ray beam.
- In the parafocusing arrangement, the incident- and diffracted-beam slits move on a circle that is centered on the sample. Divergent X rays from the source hit the sample at different points on its surface. During the diffraction process the X rays are refocused at the detector slit.
- This arrangement provides the best combination of intensity, peak shape, and angular resolution for the widest number of samples.
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