I need to calculate hkl values from an SAED image.Using the camera length and the r value I can calculate the d value but how do I assign hkl values.Please help
Calculate interplanar spacings from the SAED pattern (d-value).
Use the formula for interplanar spacing for your crystal system (e.g. simple cubic) and calculate a list of d-spacings from the associated miller indices. You need to know the appropriate lattice parameters. Take account for systematic absences.
Compare your measured interplanar spacings to your calculated ones and pick the appropriate miller indices. If you have a ring pattern you're done.
If you need to assign indices to specific spots you also use a similar procedure for interplanar angles to arrive at a solution. Several solutions may apply, but they should be related through the symmetry operations of the lattice.