Chapter

Solving crystal structures from HRTEM images by crystallographic image processing

Xiaodong Zou, Sven Hovmöller and Peter Oleynikov

in Electron Crystallography

Published in print August 2011 | ISBN: 9780199580200
Published online January 2012 | e-ISBN: 9780191731211 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199580200.003.0007

Series: International Union of Crystallography Texts on Crystallography

Solving crystal structures from HRTEM images by crystallographic image processing

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A fundamentally important feature of electron crystallography is its power in solving crystal structures directly from HRTEM images, using crystallographic image processing. With the appropriate formulas, the important factors in how to do this in practice are described, including Fourier transformation and lattice refinement, symmetry determination and origin refinement, leading up to imposing the symmetry on the experimentally observed structure factor amplitudes and phases in HRTEM images. Determination of and correcting for defocus and astigmatism and crystal misalignment, and the reconstruction of the projected potential map from a single or a few HRTEM image(s) are described.

Keywords: crystallographic image processing; Fourier transform; structure determination; symmetry determination; lattice determination; origin determination; projected potential map; defocus; astigmatism; optical distortions; crystal misalignment; contrast transfer function; Scherzer resolution

Chapter.  10025 words.  Illustrated.

Subjects: Crystallography

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