Laue Geometry

The Laue technique is useful for aligning crystals along symmetry axes and for collecting large amounts of data quickly.  Since the technique uses polychromatic radiation, the Ewald construction must be modified.  This can be done in two ways

The first method assumes two Ewald spheres, one for the shortest available l and one for the longest.

The second construct can be understood by examining the Laue equation, a•(S-S0)=nl.  The variation in l can be transfered to S-S0 making that reciprocal lattice vector variable instead of the wavelength.