Abstract
Lithium adsorption on Cu(001) at 300 K has been studied with low-energy electron diffraction (LEED) and Auger electron spectroscopy. The LEED patterns show a sequential change with increasing Li coverage; 2 × 1, 3 × 3 and 4 × 4. The 2 × 1 LEED pattern has weak streaky spots denoted by a matrix of 1 2θ 0 −1 4θ 2 in the coverage range of 0.375 ⩽ Θ ⩽ 0.4. The 4 × 4 pattern disappears upon further Li deposition and the surface becomes disordered. The features and behavior of the streaky spots are very similar to those observed for K or Cs adsorption on Ni(110) or Cu(110) at room temperature, and this leads to a structure model for 2 × 1; the Cu(001) surface undergoes a missing row type restructuring induced by Li adsorption. Li adatoms are located in missing rows formed by themselves resulting in the streaky spots. Possible structure models for the 3 × 3 and 4 × 4 structures are proposed and they are assigned to ordered surface-alloys of LiCu on Cu(001).
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