Structure determination of alkali-metal adsorbed metal surfaces
Surface structures of alkali-metal deposited Cu(001) surface depend on the temperature.
At low temperatures (less than 200 K) alkali-metal atoms adsorb on the clean Cu(001) surface as 2D films.
On the other hand, surface reconstructions occurred at room temperature. 
As a result, LEED patterns at room temperature are completely different from those obtained at low temperatures.

LEED pattern changes with increasing Li coverage at 180 and 300 K.
The structures observed at room temperature were determined by LEED analysis.

Determined structure models of Cu(001)-(2x1)-Li, Cu(001)-(3x3)-Li, and Cu(001)-(4x4)-Li.

=== Original papers ===
Missing-row-type restructuring of the Cu(001) surface induced by Li adsorption: A low-energy electron diffraction analysis. Surf. Sci. 292 (1993) L811.
Complex surface alloy formed by Li deposition on Cu(001) determined by dynamical low-energy electron diffraction. Phys. Rev. B51 (1995) 1969.
Completion of the structural determination of and rationalization of the surface-structure sequence (2x1)->(3x3)->(4x4) formed on Cu(001) with increasing Li coverage. Phys. Rev. B52 (1995) R11658.

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