Abstract
The surfaces of small regularly-shaped crystals of MgO and NiO have been examined by use of a scanning transmission electron microscopy (STEM) instrument. Images of the surfaces obtained with diffracted electron beams show surface detail with high resolution. Microdiffraction patterns obtained with beams of 15Å diameter from small crystals having one flat face parallel to the beam show the effects of the interactions of the electrons with the potential field of the crystal and of diffraction and channelling at the surface. Electron energy loss spectroscopy (ELS) of beams which have traversed flat surfaces of the crystals show energy losses due to the excitation of surface states and also energy losses associated with the generation of radiation as the electron beam enters and leaves the crystal potential field and as it is channelled along the surface by diffraction and refraction effects.
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