Omega/Theta - Rocking curve measurement

 

 

X-ray beam collimator with housing for the retractable channel-cut double cystal.

The Rocking Curve of a crystal reflection indicates the quality of the crystalline lattice. This technique is combined conveniently with a mapping stage. An Omega/Theta can be easily modified with a double crystal beam collimator to measure Rocking Curves.

Measuring a Rocking Curve requires an instrument for the Theta Scan, the Omega/Theta diffractometer. A double crystal is brought into the primary beam path to decrease the spectral width and divergency. However, the side effect is a strongly reduced intensity. Thus the double crystal is mounted on a retractable holder and is used only for the Rocking Curve measurement.