Reciprocal space
Reciprocity
Square lattice
Rectangular lattice
Oblique lattice
Translation of lattice
Rotation lattice

Interactive examples
2D crystal builder
Planes and HKL's
Finite size effect

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To begin with, lets simulate a simple square lattice. Two by two unit cells are simulated, each containing one atom at (0 0). In 3D this would be a cubic lattice. This miniature crystal is sufficient in size to illustrate the geometrical relationships. By increasing the size, we will just decrease the FWHM of the Bragg reflections. The pictures below show the atoms and the corresponding Fourier transform. Click on the pictures to get a full screen version.

The reciprocal space geometry corresponds to that of the real space. The reciprocal base vectors are of equal length and orthogonal to each other.