Crystal setting

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

Section 2.2.2.2. Crystal setting

J. R. Helliwell^a

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

2.2.2.2. Crystal setting

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Crystal setting follows the procedure given in Subsection 2.2.1.2 whereby angular mis-setting angles are given by equation (2.2.1.3). 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 $[\tan2\theta=R/D;\quad\cos2\theta=1-\lambda/c. \eqno (2.2.2.1)]$

References

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