Abstract
The field ion microscope has been used to study very low coverage oxygen adsorption on tungsten at 78°K. Adsorbed oxygen cannot be directly observed on the surface using helium ion imaging, but its presence may be inferred from resultant corrosion damage which occurs during the imaging process. Atom for atom comparison before and after an adsorption-desorption sequence allows the crystallographic position and extent of the damage to be precisely determined. Preferential damage along certain zones in the {111} and {411} regions can be correlated with the degree of unsaturation of surface metal bonds. The nature of the adsorbed species and its relationship with the adsorption site are discussed.
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