Spectroscopy of channeled particle radiation as a new method for crystal study

An investigation of the properties of channeled relativistic electrons and positrons radiation developed during last 8 years demonstrated that peculiarities in the radiation spectra can be used for studying of a number of crystal properties. The most successful achievements in this direction have been reached for the crystal Debye temperature determination, for a crystal potential refinement and for the determination of electron density near crystallographic axes and planes. As a result of relativistic electrons and positrons localization near definite atomic strings or planes the radiation spectrum of channeled particles in contrast to diffraction methods possesses ''direct'' information on the crystal potential. The method enables to study thermal vibrations correlation of atoms in a crystal lattice and also features of superstructures and complex crystals