Figure 2.2.3.1

Helliwell, J. R.

doi:10.1107/97809553602060000577

International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

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International Tables for Crystallography (2006). Vol. C. ch. 2.2, p. 30

Figure 2.2.3.1

J. R. Helliwell^a

^a Department of Chemistry, University of Manchester, Manchester M13 9PL, England

Figure 2.2.3.1

(a) Elevation of the sphere of reflection. O is the origin of the reciprocal lattice. C is the centre of the Ewald sphere. The incident beam is shown in the plane. (b) Plan of the sphere of reflection. R is the projection of the rotation axis on the equatorial plane. (c) Perspective diagram. P is the relp in the reflection position with the cylindrical coordinates $[\zeta, \xi, \varphi]$ . The angular coordinates of the diffracted beam are $[\nu, \Upsilon]$ . (d) Stereogram to show the direction of the diffracted beam, $[\nu, \Upsilon]$ , with DD′, normal to the incident beam and in the equatorial plane, as the projection diameter. From Evans & Lonsdale (1959).