Fig. 91: Small-angle X-ray scattering patterns from a crystal of 242 nm diameter polystyrene colloidal spheres in methanol. The spheres have formed an fcc crystal with the 111 planes parallel to the wall of the capillary with a lattice parameter of 370 nm. In (a) the X-ray beam is parallel to a 111 axis. In (b), the X-ray beam is parallel to an 110 axis. The large number of rings further out in the scattering pattern are caused by the form factor of the monodisperse colloidal spheres.