Abstract
This work was partially supported by the Ministry of Science of Russian Federations Grant No. 40.012.1.1.1153 d, NATO science programmes Grant PST. CLG. 980395d, and the Basque Country Government.
Highlights
Studies of alkali-metalAMadsorption on metal surfaces have been of considerable interest for several decades. This is partly related to the important technological applications of these systems due to the promoter effects of alkali adsorbates in heterogeneous catalysis and the adsorption-induced change of the work function. These investigations have played an important role in understanding of the nature of the adsorption mechanism
The main common feature of these adsorption systems is that they have different structures at low temperatures and at room temperature
This is due to the fact that at room temperature the adsorption process involves a temperature-activated vacancy formation on the surface, and the adsorbate atoms occupy these vacancies to form ordered substitutional structures
Summary
Studies of alkali-metalAMadsorption on metal surfaces have been of considerable interest for several decades. This is partly related to the important technological applications of these systems due to the promoter effects of alkali adsorbates in heterogeneous catalysis and the adsorption-induced change of the work function. The main common feature of these adsorption systems is that they have different structures at low temperatures and at room temperature. This is due to the fact that at room temperature the adsorption process involves a temperature-activated vacancy formation on the surface, and the adsorbate atoms occupy these vacancies to form ordered substitutional structures. The same structures occur if the adatoms are adsorbed at low temperature and the substrate subsequently is heated to room temperature.. The same structures occur if the adatoms are adsorbed at low temperature and the substrate subsequently is heated to room temperature. This transition is irreversible, indicating that the low-temperature structures are metastable
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