Interactive Tutorial about Diffraction Interactive example : Polygon of atoms 

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This interactive example allows the creation of a polygon of atoms and
the calculation of the corresponding Fourier transform. All atoms
have a distance of r=1.4Å from the origin. This example will
illustrate the relation between symmetry of the atomic arrangement
and the corresponding scattering pattern.
Play around with different input parameters and answer the following questions:
Once you are done, click here to verify your answers. 
© Th. Proffen and R.B. Neder, 2003 