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

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

Section Crystal setting

J. R. Helliwella

aDepartment of Chemistry, University of Manchester, Manchester M13 9PL, England Crystal setting

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Crystal setting follows the procedure given in Subsection[link] whereby angular mis-setting angles are given by equation ([link]. When viewed down a zone axis, the pattern on a flat film or electronic area detector has the appearance of a series of concentric circles. For example, with the beam parallel to [[00\bar1]], the first circle corresponds to l = 1, the second to l = 2, etc. The radius of the first circle R is related to the interplanar spacing between the (hk0) and (hk1) planes, i.e. λ/c (in this example), through [\theta], by the formulae [\tan2\theta=R/D;\quad\cos2\theta=1-\lambda/c. \eqno (]

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