Interactive Tutorial about Diffraction Interactive example: Displacement waves 

Diffuse scattering
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This interactive example allows one to create harmonic
displacement waves in a monoatomic crystal. The crystal size is
40x40 unit cells with a lattice parameter of a=5A. The
parameters defining the wave are the propagation direction
(u,v,0), direction of the displacement (x,y,0), the
wavelength, amplitude and phase of the wave. All parameters are
specified using the input fields on the right. Additionally one
can choose to calculate the resulting Xray or neutron
scattering.
Here are a few questions to explore:
Once you are done, click here to verify your answers. 
© Th. Proffen and R.B. Neder, 2003 