Abstract
The adsorption of Li on Al(100) has been studied by high-resolution core-level spectroscopy and low energy electron diffraction (LEED) at different Li coverages and temperatures. Adsorption at room temperature leads to the formation of a c(2×2)-Li phase which grows as islands in the coverage range 0.15–0.5 monolayer (ML). Analysis of Li1s and Al2p core-level spectra leads to the conclusion that the c(2×2)-Li phase contains Li atoms in a single environment and Al atoms in three different local environments. This is consistent with the results of a recent LEED analysis, which reported that the c(2×2)-Li phase is a surface binary alloy in which every second Al atom in the first layer is substituted by Li. Al2p core-level spectra taken after adsorption at 120K followed by annealing indicate that reconstruction of the Al substrate begins to occur at temperatures as low as 140K. At coverages between 0.5 and 1.0ML, Li1s spectra indicate the growth of a second layer of adsorbed Li. It is shown that the c(2×2)-2Li phase formed by adsorption of 1ML Li contains two mixed Al/Li layers separated by an Al layer, in a geometry similar to that of the first three layers of the (100) surface of the metastable Al3Li bulk alloy.
Published Version
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