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VOLUME 24 (1976) | ISSUE 5 | PAGE 269
Effect of absorptivity of a medium on the formation of hard transition radiation
Very hard quanta, for which the imaginary part of the polarizability of the medium exceeds the real part, appear in the transition-radiation spectrum at sufficiently high energies of the charge. It is shown that in this case the dependence of the boundary frequency and of the total intensity of the transition radiation on the Lorentz factor of the charge becomes stronger, changing from linear to quadratic.