X-ray diffraction properties of highly oriented pyrolytic graphite

Andreas K. Freund; Anneli Munkholm; Sean Brennan

doi:10.1117/12.259851

22 November 1996 X-ray diffraction properties of highly oriented pyrolytic graphite

Andreas K. Freund, Anneli Munkholm, Sean Brennan

Proceedings Volume 2856, Optics for High-Brightness Synchrotron Radiation Beamlines II; (1996) https://doi.org/10.1117/12.259851
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

The x-ray diffraction properties of highly oriented pyrolytic graphite (HOPG) were studied for x-ray energies ranging from 4 to 60 keV. In particular, the secondary extinction thickness was determined by recording the peak and integrated reflectivity as a function of depth below the surface. The results showed that for the high quality material investigated a thickness of 200 to 300 micrometers was sufficient to get 80% of the maximum reflectivity that is obtained for a very thick plate. Primary extinction was important for low energy and still persisted at higher energies. Inhomogeneities of the mosaic structure were observed, too, that make this material not a truly ideal mosaic monochromator crystal. However, quite high peak reflectivities between 35% and 58% were measured at FWHM of 0.25 to 0.45 degrees. A 200 micrometers thick plate was then prepared and glued on a bending device to manufacture a monochromator or analyzer with variable curvature that works from flat down to a minimum bending radius of 10 cm. The successful tests of this device confirmed that HOPG plates much thinner than those commonly used as x-ray monochromators and analyzers still have high efficiency and can be curved to achieve dynamical focusing.

Citation Download Citation

Andreas K. Freund, Anneli Munkholm, and Sean Brennan "X-ray diffraction properties of highly oriented pyrolytic graphite", Proc. SPIE 2856, Optics for High-Brightness Synchrotron Radiation Beamlines II, (22 November 1996); https://doi.org/10.1117/12.259851

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