Asymmetry of the angular distribution of radiation of channeled relativistic electrons in optically transparent crystals
| Autor: | K.B. Korotchenko, Yu.L. Pivovarov |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) Solid-state physics 010308 nuclear & particles physics media_common.quotation_subject Electron Radiation 01 natural sciences Asymmetry Azimuth 0103 physical sciences Dispersion (optics) Atomic physics 010306 general physics Radiant intensity Refractive index media_common |
| Zdroj: | JETP Letters. 103:87-93 |
| ISSN: | 1090-6487 0021-3640 |
| DOI: | 10.1134/s0021364016020077 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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