Abstract
The location of the outermost atomic layer relative to the second one of the reconstructed clean Au(110)-(1 × 2) surface has been directly determined by large angle (165°) low energy (2000 eV) Ne +/Ne 0 backscattering. The surface forms the expected “missing row” structure with a 0.20 ± 0.07 Å contraction of the first layer relative to the bulk determined atomic positions. Temperature dependent measurements (300 < T < 800 K) have been performed at a scattering angle of 123° using Na + in order to follow the phase transition from the (1 × 2) to the (1 × 1) structure. The ion scattering data measured in the 〈112〉 azimuth show a pronounced decrease of the characteristic slopes for the (1 × 2) structure and an increase of signals related with the (1 × 1) structure upon temperature increase above 700 K. We also find evidence for the existence of monoatomic steps coexisting with both structures.
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