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Geometry

  Ewald's Sphere and Streaking     18 of 18
 
The simulation opposite shows a 2D representation of an Ewald sphere intersecting a reciprocal lattice. 

This time the specimen is thin and streaking of the reciprocal lattice points occurs. Lattice points which do not actually intersect the sphere but are close, still give rise to diffraction spots, though their intensity is reduced.

Have a go imageInvestigate tilting the lattice with respect to the beam.


Questions imageWhich of these statements regarding diffraction patterns is true?

A diffraction pattern is always symmetrical about the origin.

A thinner specimen will generally give rise to fewer diffraction spots.

The shorter the wavelength of the radiation the more diffraction spots are likely from a single crystal.

 

 
 

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