Low energy electron diffraction
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In physics, Low Energy Electron Diffraction (or LEED) is a technique used to probe matter.
Electrons emitted from a hot filament are accelerated in a tube to a certain energy. They impact on a sample at a defined incidence angle. The electrons are back scattered, depending on whether Bragg diffraction occurs or not.
LEED is used in crystal growth to probe the properties of the crystal, such as crystallinity and morphology, by reading the resulting patterns on the fluorescent screen.
LEED can be compared to RHEED, or Reflection High Energy Electron Diffraction.
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