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A systematic study of surface structures of was performed by means of low-energy electron-diffraction (LEED) and Auger electron spectroscopy techniques. The experiments were carried out with increasing deposition of Li both at low temperature (90 K) and room temperature (300 K). At 90 K a series of LEED patterns, (3 X 1), (2 X 1), (3 X 1), and successive complicated structures were observed with increasing Li coverage. The sequence of the LEED patterns was interpreted as simple overlayer structures of Li in terms of a continuous increase of the packing density of deposited Li atoms sitting in the trough along the [110]direction of the Cu(110) surface. Marked differences in the sequence of the LEED structures were observed for observations at 300 K; the sequence of the structures was (1 X 2), (1 X 1), (4X 1), (5 X 1), and (n X 1) where n & 8 with an increase of Li coverage. The first (1 X 2) structure was assigned to a missing-row-type restructuring of the substrate Cu atoms. The structure models for the (4X 1), (5 X 1), and so on were discussed in terms of the formation of Li-Cu surface alloys proposed previously by Tochihara and Mizuno for the Li/Cu(100) system.

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