Abstract
A low energy ion technique for the location of adsorbed gases on surfaces has been developed. This technique involves the detection of negatively charged recoil ions when the surface is bombarded with positively charged low energy inert gas ions. The low background of negative ions from a clean surface ensures the high sensitivity of the method for detecting the presence of electronegative adsorbates. The angular distribution of the negative recoils is a direct measure of the adsorption site. The method has been applied to the study of the (2 × 1) structure of oxygen on Ni(110). The oxygen is found to be in the long bridge site 23 ± 10 pm above the Ni atoms in the (001) surface direction. The results have been supported by low energy hydrogen scattering in the double alignment geometry. The location is in agreement with other recently reported results and in addition is found to agree with the Pauling Ni-O bond length determined by Mitchell.
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