Bragg's Law a Cornerstone of Crystallography

Bragg's Law: a cornerstone of the science of crystallography

In physics parlance, Bragg's Law gives the angles for coherent and incoherent scattering from a crystal lattice. The law was derived by physicist Sir William Lawrence Bragg in 1912 and first presented on 11 November of the same year to the Cambridge Philosophical Society. In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms or molecules in a crystalline liquid or solid.

The Bragg's Law Equation:

Where n is an integer, λ is the wavelength of incident wave, d is the spacing between the planes in the atomic lattice, and θ is the angle between the incident ray and the scattering planes. Note that moving particles, including electrons, protons and neutrons, have an associated De Broglie wavelength.