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X-Ray Spectrometer Having 12 000 Resolving Power at 8 keV Energy



Lawrence T. Hudson, John F. Seely, Uri Feldman, Albert Henins


An x-ray spectrometer employing a thin (50 μm) silicon transmission crystal was used to record high-resolution Cu Kα spectra from a laboratory x-ray source. The diffraction was from the (331) planes that were at an angle of 13.26° to the crystal surface. The components of the spectral lines resulting from single-vacancy (1s) and double-vacancy (1s and 3d) transitions were observed. After accounting for the natural lifetime widths from reference double-crystal spectra and the spatial resolution of the image plate detector, the intrinsic broadening of the transmission crystal was measured to be as small as 0.67 eV and the resolving power 12 000. By recording spectra with variable source-to-crystal distances and comparing to the calculated widths from various geometrical broadening mechanisms, the primary contributions to the intrinsic crystal broadening were found to be the source height at small distances and crystal height at large distances. By reducing these two effects, using a smaller source size and aperturing down the crystal height, the intrinsic crystal broadening is limited by the crystal thickness and the rocking curve width and would be 0.4 eV at 8 keV energy (20 000 resolving power).
Review of Scientific Instruments


crystal diffraction, X-ray spectroscopy, resolving power, copper K spectrum, line broadening mechanisms


Hudson, L. , Seely, J. , Feldman, U. and Henins, A. (2018), X-Ray Spectrometer Having 12 000 Resolving Power at 8 keV Energy, Review of Scientific Instruments, [online], (Accessed June 20, 2024)


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Created May 14, 2018, Updated December 3, 2018