Asymmetry of the angular distribution of radiation of channeled relativistic electrons in optically transparent crystals

K. B. Korotchenko, Yu L. Pivovarov

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It has been shown that optical and ultraviolet radiation from relativistic electrons at planar channeling in optically transparent crystals is characterized by an unusual dependence on the polar and azimuth angles. A fraction of radiation with the frequency ω near which the derivative of the refractive index is nonzero, n'(ω) = dn(ω)/dω ≠ 0, should be observed at an angle close to π/2 with respect to the electron beam. For normal dispersion (n'(ω) > 0), this angle is smaller than π/2, whereas for anomalous dispersion (n'(ω) <0), it is larger than π/2 (“backward” radiation). A pronounced dependence of the radiation intensity on the azimuth angle φ, i.e., azimuthal asymmetry, appears beyond the region of normal and anomalous dispersion at a fixed polar angle θ. In particular, the ratio of radiation intensities at angles φ = 0 and π/2 at θ = π/2 reaches a maximum value of about the square of the refractive index.

Original languageEnglish
Pages (from-to)87-93
Number of pages7
JournalJETP Letters
Issue number2
Publication statusPublished - 1 Jan 2016


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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