| 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.
 Explore
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. |
