Electron shell effect in coherent polarization bremsstrahlung of fast electrons on light element atoms

It is shown that the spectrum of polarization bremsstrahlung of fast electrons on light element atoms with markedly pronounced electron shells have a specific structure split into high- and low-frequency components. The maximum coherence region is shifted toward frequencies lower than those predicted earlier. A carbon atom is considered to assess partial and full coherence regions of polarization bremsstrahlung.