Acta Crystallographica Section A

Crystal Physics, Diffraction, Theoretical and General Crystallography

Volume 24, Part 3 (May 1968)

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Acta Cryst. (1968). A24, 351-359    [ doi:10.1107/S0567739468000707 ]

A semi-empirical method of absorption correction

A. C. T. North, D. C. Phillips and F. S. Mathews

Abstract: An extension of Furnas's method is described. The variation of intensity of an axial reflection as the crystal is rotated about the goniometer axis is used to give a curve of relative transmission T against azimuthal angle [varphi] for the corresponding reciprocal lattice level. Transmission coefficients for any general reflexion hkl are then given approximately by T(hkl) = [T([varphi]inc) + T([varphi]ret)]/2 where [varphi]inc and [varphi]ret are the azimuthal angles of the incident and reflected beams. Equations are derived for ([varphi]inc and [varphi]ret and the accuracy of the method is discussed.

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