Indexing of Diffraction Patterns (Ring Pattern & Spot Pattern)

1. The diffraction spots present the intersection of direction vector with the incident beam
Note: The diffraction spots present the individual plane that has resulted diffraction of the incident beam
2. Zone axis has the following relation to the incident beam
Note: The diffraction angles are within 0-1 degree of incident beam, hence the zone axis is almost parallel to the incident beam.
3. The reciprocal lattice has the separation between planes equal to:
4. The spot pattern will appear in ___________ fashion for tetragonal crystal with zone axis of [001]
5. The spot pattern will appear in ___________ fashion for tetragonal crystal with zone axis of [100]