It is shown that canonical perturbation theory enables one to calculate any radiation effects in classical electrodynamics in a unified fashion. The first part of the paper deals with spontaneous and induced emission from particles for a wide range of paths. The spectral and angular characteristics of the radiation have been determined. The second part of the paper derives expressions for the scattering cross sections of particles for electromagnetic waves in the presence of an external field. The results correspond to the crossed-field model.
Department of Theoretical Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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