Skip to main content

Bragg's Law For Diffraction


\LARGE 2d\sin\theta = n\lambda



The Terms


d - Spacing between planes in the atomic lattice [Units: m]

\theta - Angle between the incident wave and the scattering planes

n - An integer determined by the order

\lambda - Wavelength of the incident wave [Units: m]



What Does It Mean

In crystallography, this equation is used to find the angles of coherent and incoherent scattering off a crystal lattice. For direction in which the above equation is satisfied, waves scattered from atomic planes separated by a distance d interfere constructively and produce maxima on the diffraction pattern.



Further information at Warwick

Bragg's Law of Diffraction is covered in the third year module "PX393 Crystal Physics".

bragg2

William Lawrence Bragg

1890-1971