Abstract
Scanning an aluminum (111) surface with low-energy electrons (20–200 eV), diffraction patterns in the speciment current image were observed to change upon exposure to oxygen. In particular at a primary beam energy of 20.8 eV relative to the vacuum, the pattern of the clean surface includes both hexagonal and trigonal features. Upon exposure to oxygen the hexagonal part of the image fades continuously so that by 290 L of oxygen only the feature of trigonal symmetry remains. Since oxygen is known from low-energy electron diffraction (LEED) and surface extended X-ray adsorption fine structure (SEXAFS) to form an ordered ad-layer on the (111) surface of aluminum, this suggests that current image diffraction (CID) can also be used to investigate adsorption.
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