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Extension of the time‐dependent dynamical diffraction theory to `optical phonon'‐type distortions: application to diffraction from coherent acoustic and optical phonons

Extension of the time‐dependent dynamical diffraction theory to `optical phonon'‐type... An extension of the time‐dependent Takagi–Taupin theory to `optical phonon'‐type distortions is presented. By splitting the susceptibility into the contributions from each atom in a unit cell, modifications to the structure factor as well as lattice parameter are taken into account. The result is a compact, surprisingly simple, equation with a strong formal similarity to the classical Takagi–Taupin equation, with the latter included as a special case. Time dependence is explicitly retained and thus the analysis is applicable to situations where the crystal is modified on time scales comparable with that for the X‐rays to traverse an extinction depth. A comparison is made between the influence of coherent acoustic and optical phonons on the diffraction of X‐rays. Numerical and perturbative analytical solutions of the generalized Takagi–Taupin equation are presented in the presence of such phonons. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A Foundations of Crystallography Wiley

Extension of the time‐dependent dynamical diffraction theory to `optical phonon'‐type distortions: application to diffraction from coherent acoustic and optical phonons

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References (29)

Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S010876730201704X
Publisher site
See Article on Publisher Site

Abstract

An extension of the time‐dependent Takagi–Taupin theory to `optical phonon'‐type distortions is presented. By splitting the susceptibility into the contributions from each atom in a unit cell, modifications to the structure factor as well as lattice parameter are taken into account. The result is a compact, surprisingly simple, equation with a strong formal similarity to the classical Takagi–Taupin equation, with the latter included as a special case. Time dependence is explicitly retained and thus the analysis is applicable to situations where the crystal is modified on time scales comparable with that for the X‐rays to traverse an extinction depth. A comparison is made between the influence of coherent acoustic and optical phonons on the diffraction of X‐rays. Numerical and perturbative analytical solutions of the generalized Takagi–Taupin equation are presented in the presence of such phonons.

Journal

Acta Crystallographica Section A Foundations of CrystallographyWiley

Published: Jan 1, 2003

Keywords: ; ;

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