The Physics of LEED
Low-energy electron diffraction is termed a “dynamical” process to express the fact that non-geometrical parameters play an important role in its description: these parameters (mainly atomic scattering amplitudes, inner potential and inelastic electron damping), together with multiple scattering of the electrons through the crystalline lattice, complicate the understanding of the diffraction process. For example, the analogy with X-ray diffraction (with its simple Bragg reflection conditions, etc.) is obscured by the dynamical character of the scattering. This is readily seen in the failure of “kinematic” theory (single-scattering theory) to explain LEED intensity vs. energy curves (IV-curves). Background information about the development and application of LEED, including experimental questions, will be found in Refs. [2,4–9].
KeywordsMultiple Scattering Reflection Maximum Bragg Condition Transmission Phase Reflection Amplitude
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