Tensor LEED analysis of the Cu(110)-(2×3)-N surface structure

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Abstract
A tensor LEED analysis of the Cu(110)-(2×3)-N surface structure supports a reconstruction model in which the topmost layer can be described as a pseudo-(100)-c(2×2)-N overlayer, with metal corrugation of about 0.52 Å in the reconstructed layer. Each N atom is nearly coplanar with the local plane formed by the four neighboring Cu atoms. Of the four NN atoms per unit mesh, three also bond to Cu atoms in the layer below and are therefore five-coordinate. Two of the three five-coordinate sites result from appreciable lateral displacements toward each other of both N atoms and Cu atoms below in the topmost Cu(110) layer. Average N-Cu bond lengths for the five-coordinate sites (1.87 Å) agree well with prediction, while the bond lengths for the four-coordinate sites (1.85 Å) appear somewhat long. These different N sites are discussed in relation to a recent STM study, and results from this LEED analysis are contrasted with those from the previous LEED study, which supported a 〈001〉-missing row reconstruction of the surface.