Low-energy x-ray interaction coefficients: Photoabsorption, scattering, and reflection: E = 100–2000 eV Z = 1–94☆

Abstract The primary low-energy x-ray interactions within matter are photoabsorption and coherent scattering, which can be efficiently described for photon energies outside the threshold regions by using atomic scattering factors. These may be uniquely determined through quantum dispersion relations from photoabsorption data. With the available fittings of the photoabsorption cross sections and with a new compilation of such data for the region 30–300 eV, continuous sets of the photoabsorption cross sections from 30 to 10 000 eV have been determined for 94 elements. With these, for the region 100–2000 eV, atomic scattering factors which are independent of scattering angle and which include the relatively strong anomalous dispersion structures have been obtained. Methods are reviewed and currently important examples of the application of atomic scattering factors to the detailed characterization of selected x-ray mirror monochromators and of Bragg multilayer and crystal analyzers for low-energy x-ray analysis are presented.

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