Спектрометр доплеровского уширения аннигияционной линии

Abstract

Positron annihilation (PA) techniques provide arrangements for precision studies of defect and electron structure of materials in materials science. Doppler broadening (DB) method is one of the three basic methods of PA. It gives information about the distribution of electrons by magnitude in the material and various types of defects.The law of momentum conservation in the process of PA can be expressed in the momentum transfer of the electron-positron pair to the annihilation photons pair. Thus, the shift of annihilation photons' energy (Doppler broadening) carries information about the momentum of the electron, which have taken plece in the process of annihilation. It is useful to study the electron structure of the material, as well as for the defects' studies. This paper contains a description of the DB spectrometer developed at the Department of General Physics of TPU.