Features of a planar x-ray waveguide (PXW) functioned on the base of an x-ray total reflection phenomenon and been distinguished by an air clearance presense as the transportation medium are discussed. It is shown that the narrow size clearance area exists, and it is characterized by a resonance manner of an x-ray beam guiding across the waveguide. The high efficiency of the x-ray beam transporation systems based on planar x-ray waveguides allows them to complete with guiding abilities of the polycapillary optics. Characteristics of an x-ray diffractometer and TXRF-spectrometer equipped with PXW are analyzed. The experimental data of a thin film testing at application of the diffractometer and the TXRF spectrometer built with using PXW are presented. The design of the planar x-ray waveguide-monochromator is considered, in passing.
A simple model of X-Ray standing waves (XSW) formation in the slit between two polished parallel flat plates formed a planar X-Ray waveguide for the angle area restricted by the critical total reflection angle is developed. It is shown that the model is true for a case of the Bragg reflection. The conditions required for XSW to appear in the slit space are formulated and a slit size interval conforming to these conditions is evaluated. A mechanism of a XSW intensity decrease in a planar X-ray waveguide is proposed. The efficiency of the waveguide on a comparison base of the X- Ray forming system completed by a slit-cut superposition set with one equipped by a planar X-Ray waveguide is evaluated. Some recommendations on the application of the planar X-Ray waveguide in X-Ray structural and spectral studies of surface are presented.
The luminescence dampness of PbWO4 crystals upon their excitation by H+ ion beam during prolonged time intervals was studied. An exponential law for the luminescence yield reduction at a density of the beam proton irradiation of j approximately equals 6 X 1012 ion/cm2 was registered, with the yield falling to a final value of J(infinity ) approximately equals 1/3 X J0. Similar kind modification of the luminescence yield suggests that some channels of the radiative relaxation process for intermediate excited states in the PbWO4 bandgap could be clocked in part by local high energy excitation produced by energetic protons in the unit cells of lead tungstate.
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