= Crystallographic electron channeling
<Crystallographic electron channeling> is orientation-dependent propagation of <electrons> in a <crystal>, where the spatially ordered <electrostatic potential> changes how the beam travels relative to atomic planes or columns. Changing crystal orientation can therefore change the collected signal even without changing chemical composition.
A small specimen tilt at fixed beam <energy> is a useful test: brightness changes correlated with orientation suggest a channeling or <electron diffraction> contribution. This matters when interpreting <backscattered-electron atomic-number contrast> or atomic-scale chemical maps. A bright region is not by itself proof of a different <atomic number>.
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