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Publicly Available Published by De Gruyter (O) April 16, 2010

Characteristics of precession electron diffraction intensities from dynamical simulations

  • Wharton Sinkler and Laurence D. Marks

Abstract

Precession Electron Diffraction (PED) offers a number of advantages for crystal structure analysis and solving unknown structures using electron diffraction. The current article uses many-beam simulations of PED intensities, in combination with model structures, to arrive at a better understanding of how PED differs from standard unprecessed electron diffraction. It is shown that precession reduces the chaotic oscillatory behavior of electron diffraction intensities as a function of thickness. An additional characteristic of PED which is revealed by simulations is reduced sensitivity to structure factor phases. This is shown to be a general feature of dynamical intensities collected under conditions in which patterns with multiple incident beam orientations are averaged together. A new and significantly faster method is demonstrated for dynamical calculations of PED intensities, based on using information contained in off-central columns of the scattering matrix.


* Correspondence address: UOP LLC, 50 E. Algonquin Rd., 60017-5017 Des Plaines, IL, U.S.A.,

Published Online: 2010-04-16
Published in Print: 2010-03

© by Oldenbourg Wissenschaftsverlag, München, Germany

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