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Dynamical Theory of X-Ray Diffraction$
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André Authier

Print publication date: 2003

Print ISBN-13: 9780198528920

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198528920.001.0001

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n-beam dynamical diffraction

n-beam dynamical diffraction

Chapter:
(p.225) 9 n-beam dynamical diffraction
Source:
Dynamical Theory of X-Ray Diffraction
Author(s):

ANDRÉ AUTHIER

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198528920.003.0009

This chapter is concerned with the cases where several reciprocal lattice points are close to the Ewald sphere and several waves simultaneously excited (multiple-beam or n-beam diffraction). The principle of Renninger-scans is given and it is shown how the solutions of the fundamental equations of the dynamical theory are obtained in the general case. The particular case of the three-beam coplanar case is then considered. One section in this chapter is devoted to the determination of absolute phases using n-beam absorption and its application for structure determinations. The last section explains the enhancement of the anomalous absorption effect (super-Borrmann effect) in specific three-beam cases.

Keywords:   multiple-beam diffraction, n-beam diffraction, Renninger-scans, three-beam diffraction, absolute phases, anomalous absorption, super-Borrmann effect

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