X-ray diffraction help

Oct 2014
X-ray diffraction data were collected from PbS. The material is cubic, with four formula units per unit cell. The first eight lines in an X-ray powder diffraction trace correspond to the following reflections: 111, 200, 311, 222, 400, 331 and 420. The ratio of intensities for the 420 and 331 reflections was 1.7:1.

Use these observations to determine whether galena has a structure similar to cesium chloride, sodium chloride or zinc sulfide.

How do I even begin this?


Apr 2008
Bedford, England
Find diffraction traces for cesium chloride, sodium chloride or zinc sulfide
Ideally look for descriptions which follow the same style as the description in the question.
Any of them follow a similar pattern to the one described?