Electron Diffraction

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About this simulation

Elastic scattering from a polycrystal is reduced to one family of planes and first-order Bragg diffraction. The wavelength includes the relativistic momentum correction. Dots represent detected scattered electrons, with illustrative 1.5 mm Gaussian radial blur. Absolute scattering rates and other rings are omitted.

What students can explore

Double the voltage and compare the ring radius. Then change the spacing between crystal planes.
Electrons build a diffraction ring one detection at a time. Higher accelerating voltage gives shorter de Broglie wavelengths and smaller rings.

Learning objectives

1Double the voltage and compare the ring radius. Then change the spacing between crystal planes.

Questions teachers ask

How does this work?

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