Publication details

Linearly graded GeSi beam-expanding/compressing X-ray monochromator

Authors

KORYTÁR D. FERRARI C. MIKULÍK Petr VAGOVIČ P. DOBROČKA E. ÁČ V. KONOPKA P. ERKO A. ABROSIMOV N.

Year of publication 2010
Type Article in Periodical
Magazine / Source Journal of Applied Crystallography
MU Faculty or unit

Faculty of Science

Citation
web http://journals.iucr.org/j/issues/2010/01/00/aj5143/aj5143bdy.html
Field Solid matter physics and magnetism
Keywords X-ray diffraction; X-ray optics; Monochromators
Description In standard single-crystal V-channel germanium (220) X-ray beam-expanding/compressing monochromators for Cu K[alpha]1 radiation, a total beam expansion/compression of 5 and 10 corresponding to the asymmetry angles of 9deg and 12deg is achieved, respectively. Higher one-dimensional beam expansion/compression is achievable using larger angles of asymmetry at the expense of a decrease in the total intensity. To increase the intensity, a linearly graded Ge-rich GexSi1-x single crystal was used to prepare a monochromator with 15deg asymmetry angles (total expansion/compression factor of 21) for Cu K[alpha]1 radiation. The X-ray diffraction measurements show more than three times higher peak intensity at the output compared with that of a pure Ge monochromator.
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