Low-energy electron diffraction

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What Wikipedia says

Low-energy electron diffraction (LEED) is a technique for the determination of the surface structure of single-crystalline materials by bombardment with a collimated beam of low-energy electrons (30–200 eV) and observation of diffracted electrons as spots on a fluorescent screen.

Excerpt from the Wikipedia article “Low-energy electron diffraction”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Killkoll at English Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.