A quantitative analysis of the cone-angle dependence in precession electron diffraction

Precession electron diffraction (PED) is a technique which is gaining increasing interest due to its ease of use and reduction of the dynamical scattering problem in electron diffraction. To further investigate the usefulness of this technique, we have performed a systematic study of the effect of p...

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Bibliographic Details
Published in:Ultramicroscopy 2008-05, Vol.108 (6), p.514-522
Main Authors: Ciston, J., Deng, B., Marks, L.D., Own, C.S., Sinkler, W.
Format: Article
Language:English
Subjects:
Bulk charge density
Kinematical extinction
Multislice simulation
Precession electron diffraction
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Summary:Precession electron diffraction (PED) is a technique which is gaining increasing interest due to its ease of use and reduction of the dynamical scattering problem in electron diffraction. To further investigate the usefulness of this technique, we have performed a systematic study of the effect of precession angle on the mineral andalusite where the semiangle was varied from 6.5 to 32 mrad in five discrete steps. The purpose of this study was to determine the optimal conditions for the amelioration of kinematically forbidden reflections, and the measurement of valence charge density. We show that the intensities of kinematically forbidden reflections decay exponentially as the precession semiangle ( ϕ) is increased. We have also determined that charge density effects are best observed at moderately low angles (6.5–13 mrad) even though PED patterns become more kinematical in nature as the precession angle is increased further.
ISSN:0304-3991
1879-2723
DOI:10.1016/j.ultramic.2007.08.004