Ion scattering study of reconstruction in the Au(110)-(1×2) surface

Structural models for the clean Au(110)-(1 × 2) surface have been evaluated by comparison of calculations to experimental He + backscattering surface yield measurements. Angular scans of the surface yield around the [101] and [100] off-normal axes are asymmetric. These results are in reasonable agreement with missing row surface models incorporating lateral translations in the second row and either an expansion or contraction of the top layer. Energy scans of the on-axis surface yield are consistent with these results. Lack of agreement between the experimental and calculated widths of the angular scans indicate that the structure models do not completely describe the surface.