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  Rotating Crystal Method     3 of 7
In the rotating crystal method, a single crystal is mounted with an axis normal to a monochromatic x-ray beam. A cylindrical film is placed around it and the crystal is rotated about the chosen axis. 

As the crystal rotates, sets of lattice planes will at some point make the correct Bragg angle for  the monochromatic incident beam, and at that point a diffracted beam will be formed.  

The reflected beams are located on the surface of imaginary cones. When the film is laid out flat, the diffraction spots lie on horizontal lines.

Have a go imageExplore the rotating crystal method by clicking on the start button repeatedly.

The chief use of the rotating crystal method is in the determination of unknown crystal structures.

laid out film




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