INFLUENCE OF REFLECTION ASYMMETRY ON COHERENT EMISSION OF RELATIVISTIC ELECTRONS IN CRYSTALS

The previously proposed method for calculating the yield of di racted real photons is modi ed using the Darwin and Prince approach for multiple re-re ections of photons on the re ecting planes of the crystal using the Monte Carlo method. The in uence of the asymmetry of the re ecting plane relative to the output surface on the output of di racted radiation is discussed. The results of measurements of the angular distributions of parametric X-ray radiation (PXR) of relativstic electrons in crystals in which the re ecting plane was not perpendicular to the output surface are analyzed. It is shown that the shape of the angular distributions of the emission of fast electrons in thin crystals can be described with su cient accuracy in the framework of the kinematic theory of PXR taking into account the contribution of the di raction of real photons for both symmetric and asymmetric scattering geometry. Information for the conclusion about the ratio of the measured radiation outputs absolute values with the calculated ones is not enough. It is necessary to measure the radiation yields or angular distributions for two identical re ective planes with di erent asymmetry values for the same experimental conditions. È. Å. Âíóêîâ, È. Ñ. Âîëêîâ, Þ. À. Ãîïîíîâ, Ì. À. Ñèäíèí, Ð. À. Øàòîõèí 153

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