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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Accuracy and precision of thickness determination from position-averaged convergent beam electron diffraction patterns using a single-parameter metric.
Ultramicroscopy 2017 October
Position-averaged convergent beam electron diffraction patterns are formed by averaging the transmission diffraction pattern while scanning an atomically-fine electron probe across a sample. Visual comparison between experimental and simulated patterns is increasingly being used for sample thickness determination. We explore automating the comparison via a simple sum square difference metric. The thickness determination is shown to be accurate (i.e. the best-guess deduced thickness generally concurs with the true thickness), though factors such as noise, mistilt and inelastic scattering reduce the precision (i.e. increase the uncertainty range). Notably, the precision tends to be higher for smaller probe-forming aperture angles.
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