Abstract
The spherical jellium model is applied in studying the electronic properties of colloids/clusters consisting of two types of metal. Although the jellium model is far from exact, it can give insight into the overall properties of these systems that otherwise are too complex for most other electronic structure studies. Special emphasis is put on the stability as a function of system size for which it is found that both metals contribute to the regularity with which particularly stable systems occur, and on the Fermi energy as a function of system size. The latter is of relevance in the catalytic activity of such systems, that has been studied experimentally, and is found to display an oscillatory behaviour that correlates with that of the relative total energy but also to be overall lower than that of the pure systems consisting of only one type of atoms.
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