Thickness and Bending Effects. Williams, D. B. & Carter, C. B. In Williams, D. B. & Carter, C. B., editors, Transmission Electron Microscopy: A Textbook for Materials Science, volume 24, pages 407–417. Springer US, Boston, MA, 2009. Paper doi abstract bibtex We see diffraction contrast in an image for two reasons: either the thickness of the specimen varies or the diffraction conditions change across the specimen: the t effect and the s effect! The thickness effect: when the thickness of the specimen is not uniform, the coupling (interference) of the direct and diffracted beams occurs over different distances, thus producing a thickness effect. Don’t confuse diffraction contrast due to thickness changes with mass-thickness contrast discussed in the previous chapter. The effects are very different. The diffraction contrast changes with small changes in tilt, but the mass-thickness contrast doesn’t.
@incollection{williams_thickness_2009,
address = {Boston, MA},
title = {Thickness and {Bending} {Effects}},
volume = {24},
isbn = {978-0-387-76501-3},
url = {https://doi.org/10.1007/978-0-387-76501-3_24},
abstract = {We see diffraction contrast in an image for two reasons: either the thickness of the specimen varies or the diffraction conditions change across the specimen: the t effect and the s effect! The thickness effect: when the thickness of the specimen is not uniform, the coupling (interference) of the direct and diffracted beams occurs over different distances, thus producing a thickness effect. Don’t confuse diffraction contrast due to thickness changes with mass-thickness contrast discussed in the previous chapter. The effects are very different. The diffraction contrast changes with small changes in tilt, but the mass-thickness contrast doesn’t.},
language = {en},
urldate = {2021-09-02},
booktitle = {Transmission {Electron} {Microscopy}: {A} {Textbook} for {Materials} {Science}},
publisher = {Springer US},
author = {Williams, David B. and Carter, C. Barry},
editor = {Williams, David B. and Carter, C. Barry},
year = {2009},
doi = {10.1007/978-0-387-76501-3_24},
keywords = {Bloch Wave, Bragg Condition, Diffract Beam, Thickness Effect, Wedge Angle},
pages = {407--417},
}
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