DETERMINATION OF THE RECONSTRUCTION OF CU(100)-(2X3)-N WITH HIGH-ENERGY ION-SCATTERING

Surface yield measurements with single-alignment high-energy ion scattering, at normal incidence, are used to show that the Cu(110)-(2X3)-N surface is reconstructed according to an additional-row model, where the first-layer density of Cu atoms is increased to 4/3 monolayers. A surface-reconstruction model involving missing rows can be excluded. We also find that 2/3 of the second-and third-layer atoms are displaced laterally, from their bulklike positions, by 0.30 and 0.07 angstrom, respectively. Off-normal-incidence measurements indicate additional vertical atomic displacements in the second and third layers.