We present the first real-space observation of well defined single adsorbates: oxygen atoms forming the 2×{}1 structure on Ni(110). The sawtooth model is consistent with all experimental results. The structure consists of domains, separated in the [11̄0] direction by uncovered Ni ribbons 1{} surface unit cells wide. Such domain walls appear responsible for the θ=0.35 coverage of the saturated chemisorption structure.
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Baró et al. (1984) studied this question.
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