Microwave radiation stimulated by atom or ion beams

Perspectives of high-frequency stimulated emission source applying accelerated beams of charged atoms which ones are widely used at present are analyzed. Radiation mechanism based on high-frequency intratomic electronic transitions due to anomalous Doppler´s effect on slow waves is considered, while the low-frequency oscillations of atoms are neglected. Several slow surface wave systems with dielectric layers are estimated. In aggregate process has a complex nature since photon radiation is accompanied by excitation of atoms with following emission of more high-frequency photons. Requires to parameters of such systems and atomic beams for observation of stimulated emission needed for diverse applications are established.