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===Vacuum requirements===
Because gas molecules diffract electrons and affect the quality of the electron gun, RHEED experiments are performed under vacuum. The RHEED system must operate at a pressure low enough to prevent significant scattering of the electron beams by gas molecules in the chamber. At electron energies of
==RHEED patterns of real surfaces==
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*A Review of the Geometrical Fundamentals of RHEED with Application to Silicon Surfaces, John E. Mahan, Kent M. Geib, G.Y. Robinson, and Robert G. Long, ''J.V.S.T.'', A 8, 1990, pp. 3692–3700
{{Crystallography}}
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