Figure 9.1.6.1

Dauter, Z.; Wilson, K. S.

doi:10.1107/97809553602060000671

International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

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International Tables for Crystallography (2006). Vol. F. ch. 9.1, p. 179 | 1 | 2 |

Figure 9.1.6.1

Z. Dauter^a ^* and K. S. Wilson^b

^a National Cancer Institute, Brookhaven National Laboratory, NSLS, Building 725A-X9, Upton, NY 11973, USA, and ^bStructural Biology Laboratory, Department of Chemistry, University of York, York YO10 5DD, England
Correspondence e-mail: dauter@bnl.gov

Figure 9.1.6.1

The Ewald-sphere construction. A reciprocal-lattice point lies on the surface of the sphere, if the following trigonometric condition is fulfilled: $[1/2d = (1/\lambda)\sin \theta]$ . After a simple rearrangement, it takes the form of Bragg's law: $[\lambda = 2d \sin \theta]$ . Therefore, when a reciprocal-lattice point with indices hkl lies on the surface of the Ewald sphere, the interference condition for that particular reflection is fulfilled and it gives rise to a diffracted beam directed along the line joining the centre of the sphere to the reciprocal-lattice point on the surface.