Abstract
Lithium-atom adsorption on Si(001)2 × 1 has been studied by electron energy loss spectroscopy (EELS). No overlayer plasmon (OLP) is observed even at high lithium-atom coverage. By contrast, sodium, potassium, rubidium and cesium monolayers show prominent peaks of OLP in EEL spectra. It is shown that the structure and electronic properties of lithium overlayers are also different from those of other alkali-metal atoms. This is deduced by low energy electron diffraction, Auger electron spectroscopy and work-function measurement.
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