Electron-beam back-scattered diffraction

Figure 11.18 (a) Optical micrograph of an abnormally grown twinned PMN-35PT ceramic with its 3-D shape (b) Electron-beam back-scattered diffraction analysis shows the crystallographic relationship between two domains in the twinned PMN-35PT ceramic. After Refs [77, 78]. 

In this method, the electrode snrface is snbjected to a beam of low-energy (50 to 500 eV) electrons, and the elastically back-scattered electrons are collected onto a phosphor screen. The appearance of distinct diffraction spots (LEED patterns) on the screen indicates an ordered near-surface region. For known monatomic and small-molecule adsorbates, the adlayer stractural symmetry may be deduced readily from the LEED pattern, especially when information on the surface coverage is available from other experiments. For complex molecules, extraction of the substrate-adsorbate interfacial stracture from digitized LEED data is a nontrivial computational task. °... 

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