X-rays scattered from a crystal will show constructive interference provided their wavelength (
) fits the equation λ
2d sin θ = n λ
d is the spacing between atoms of the crystal, the angle through which the rays have scattered and θ n is any whole number
This is the cornerstone of the science of X-ray crystallography.
Symmetrically spaced atoms cause re-radiated X-rays to reinforce each other in the specific directions where their path-length difference, 2d sin θ, equals an integer multiple of the wavelength λ (Photo credit: Wikipedia)
Art in Science – Protein crystals (somethingaboutscience.wordpress.com)
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