International
Tables for
Crystallography
Volume H
Powder diffraction
Edited by C. J. Gilmore, J. A. Kaduk and H. Schenk
International Tables for Crystallography (2018). Vol. H, ch. 3.1, p. 229

Figure 3.1.13 

J. P. Cline,a* M. H. Mendenhall,a D. Black,a D. Windovera and A. Heninsa

aNational Institute of Standards and Technology, Gaithersburg, Maryland, USA
Correspondence e-mail:  james.cline@nist.gov

[Figure 3.1.13]
Figure 3.1.13

Illustration of the effect of the Johansson optic on the Cu Kα emission spectrum. (a) Data collected for the Si 333 single-crystal reflection on a linear scale. (b) Analogous data from Johansson optic alone on a log scale. Both data sets were collected with 0.05 mm incident and receiving slits. The near absence of the Kα2 scatter displayed in (b) can only be realized with the use of a properly aligned anti-scatter slit located at the focal line of the optic.