LEED

• LEED acronym stands for Low Energy Electron diffraction, and is a method used for making crystal structures visible.

:A LEED system is based on two parts, an Electron gun and a phosphor screen. The electron gun directs an electron beam towards the crystal probe, under normal circumstances impacting vertically into the surface of the crystal.

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:Kinematically reflected electrons (the wave-vector k has the same absolute value as the wave-vector of the impacting electron had) differ from the impacting electrons direction by a vector delta g which has to be a vector of the reciprocal lattice. This way the reflected electrons can only have directions which represent the reciprocal lattice of the crystal probe.

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:As the reciprocal lattice is a (somehow) simple construction based on the real lattice of the crystal, you can easily make the real crystal structure/lattice visible, even though you'll always just have the top view.

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• LEED is an acronym which stands for Leadership in Energy and Environmental Design, a rating system developed by the U.S. Green Building Council to certify buildings with sustainable features.

Electron gun: An electron gun is a component that produces an electron stream that has a precise kinetic energy, being used in all TVs and monitors which use cathode ray tube technology....

Electron beam: REDIRECT cathode ray...

Absolute value: In mathematics, the absolute value (or modulus1) of a real number is its numerical value without regard to its sign. So, for example, 3 is the absolute value of both 3 and −3. In computers, the mathematical function used to perform this calculation is usually given the name abs()....