Low-energy electron diffraction as a method of investigation of band structure: applications in photoelectron spectroscopy. (Review)

Review presents theoretical and experimental bases of low-energy electron diffraction spectroscopy - the most direct technique to study E(k) band structure of unfilled high-lying electron states. The cited experimental data testify that these states may be characterized by essential deviations from free-electron dispersion and may depend essentially on multielectron effects. It is shown that high-lying states determined in the course of this experiment may be directly used in photoelectron spectroscopy representing the basic technique to investigate into valent states. It enables to solve the principal problem of three-dimensional quasi-wave vector resolution of electron structure