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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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Propagation of X-rays in highly deformed crystals

Propagation of X-rays in highly deformed crystals

Chapter:
(p.406) 14 Propagation of X-rays in highly deformed crystals
Source:
Dynamical Theory of X-Ray Diffraction
Author(s):

ANDRÉ AUTHIER

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198528920.003.0014

This chapter concerns highly deformed crystals where the Eikonal approximation is no longer valid. An expression is given for the limit of validity of this approximation. Takagi's equations are extended so as to apply to highly deformed crystals. Their resolution is the discussed and the principle of their numerical integration in an inverted Borrmann triangle given. The ray concept is generalized to the case of strong deformations by noting that new wavefields are generated in the highly strained regions; this is known as the interbranch scattering effect. The last part of the chapter is devoted to an account of the statistical dynamical theories for highly imperfect crystals, with emphasis on Kato's statistical theories. Examples of experimental test of the dynamical theory are also given.

Keywords:   Eikonal approximation, strong deformations, deformed crystals, Takagi equations, Borrmann triangle, numerical integration, interbranch scattering, statistical dynamical theory

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