This feature can be helpful in indexing powder diffraction patterns of unknown symmetry.
It will not replace a full Rietveld structural refinement, but it can be used to get a preliminary idea of the symmetry
of the underlying
lattice. After doing a radial plot of some sort (plotting versus Q, 2-theta, or Q2), set the drop-down menu
under "Show Powder Diffraction Line Positions" to select the symmetry of a lattice to test.
(Possibilities are a lamellar structure, which is one-dimensional, 6 two-dimensional nets,
or the 14 3-dimensional Bravais lattices). A new window will appear which will allow you to visually
index your diffraction pattern to the chosen lattice.
Note that if the "Show Powder Rings" check box has been set in the Image panel then rings for the region of interest will also appear on the false color image. |