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Lattice imaging in low-angle and high-angle bright-field scanning transmission electron microscopy
K Watanabe1, Y Kikuchi, T Yamazaki
1Tokyo Metropolitan College of Technology, Tokyo, 140-0011 Japan.
Abstract:
Atomic resolution low-angle bright-field (LABF) scanning transmission electron-microscope (STEM) images and high-angle bright-field (HABF) STEM images of [011]-orientated Si have been experimentally obtained together with high-angle annular dark-field (HAADF) STEM images. The contrast formation mechanisms of the LABF STEM and HABF STEM images are examined in comparison with HAADF STEM images. The HABF STEM images independent of defocus and thickness have spatial resolution comparable with HAADF STEM images, and are shown to be given as a simple convolution under the non-dispersion approximation of localized Bloch waves.
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