Abstract
The interaction of oxygen with potassium predosed Ru(001) has been studied by means of thermal desorption (TD), Auger electron spectroscopy (AES), electron energy loss spectroscopy (EELS) and work function (WF) measurements. These results were compared with those reported earlier on Na and Cs precovered Ru(001). It was found that the initial sticking coefficient, S 0, increased linearly with alkali coverages θ am, in the sequence Na-K-Cs. The TD, WF and EELS data indicated predominance of the strong oxygen-ruthenium interactions over the alkali-oxygen interactions at low potassium and oxygen coverages (θ K and θ O, respectively). Above certain θ K and θ O (θ K > 0.12 and θ O > 0.6), the coincident O 2, K and K 2O TD peaks at 890 K, the EL feature at ~ 28 eV, and the appearance of a shoulder in the WF I–V curves were interpreted as the formation of K-O-Ru complexes gathered in patches on the Ru(001) surface. This behaviour was common for the three alkali metals when coadsorbed with oxygen.
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