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Effect of anomalous photoabsorption in parametric X-ray radiation under asymmetric reflection conditions

Research paper by S. V. Blazhevich, A. V. Noskov

Indexed on: 09 Sep '08Published on: 09 Sep '08Published in: Technical Physics



Abstract

Parametric X-ray radiation (PXR) of a relativistic electron crossing a monocrystalline plate is considered in the Laue scattering geometry. Expressions describing the spectral-angular distributions of PXR and diffracted transient radiation (DTR), which are formed in atomic planes arranged at an arbitrary angle δ to the surface of a crystalline plane (asymmetric reflection), are derived in the two-wave approximation of the dynamic diffraction theory. The conditions under which the effect of anomalously weak photoabsorption (Borman effect) is manifested most clearly are determined. This effect can considerably enhance the intensity of the sources of tunable quasi-monochromatic X rays, which are based on the PXR mechanism.