Simple crystallography using protein diffraction
The image below represents a 1-deg oscillation around the horizontal axis
recorded for a protein crystal using CuKa radiation and a 300-mm Image
Plate scanner set perpendicular to the primary beam at 220 mm from the
crystal. The crystal is trigonal with the following cell constants: a=123,
Try to find the answer to each of the following problems:
1. Which of the crystal axes is nearly parallel to the primary beam?
2. Approximately, how are the other crystallgraphic axes oriented relative
to the Image Plate at this crystal orientation?
3. What is the angular deviation of the axis in question 1. from the
4. Try to estimate the crystal mosaicity.
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Last update: June 4, 1998