Abstract
Oxygen or cesium adsorption and coadsorption on a (100) tungsten crystal at room temperature have been studied by work-function measurements φ (Kelvin Method), Auger electron spectroscopy (AES) and LEED. Cesium adsorption results are in accordance with already known studies, except for new features in the Auger spectrum. For oxygen adsorption a close agreement is found with Madey φ-measurements, and a complex evolution in LEED patterns suggests the onset of oxidation. The increase in the dipole moment of cesium adsorbed on oxygen covered W(100) accounts for the lowering of the work function minimum and for the increase in the cesium monolayer density shown by AES, consistently with work-function values in qualitative agreement with Lang theoretical approach. However the cesium coverage at φ minimum seems not to be reduced by oxygen. A new peak in the Auger spectrum, associated with coexisting oxygen and cesium, suggests the existence of cesium oxide.
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