Recording of cone-axis photograph

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. 36

Section 2.2.5.5. Recording of cone-axis photograph

J. R. Helliwell^a

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

2.2.5.5. Recording of cone-axis photograph

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A cone-axis photograph is recorded by placing a film enclosed in a light-tight envelope in the screen holder and using a small precession angle, e.g. 5° for a small molecule or 1° for a protein. The photograph has the appearance of concentric circles centred on the origin of reciprocal space, provided the crystal is perfectly aligned. The radius of each circle is $[r_n=s\tan\bar\nu_n,\eqno (2.2.5.8)]$ where $[\cos\bar\nu_n=\cos\bar\mu-\zeta_n.\eqno (2.2.5.9)]$ Hence, $[\zeta_n=\cos\bar\mu-\cos\tan^{-1} (r_n/s)]$ .

References

International Tables for Crystallography (2006). Vol. C. ch. 2.2, p. 36