Abstract
AbstractSoft x‐ray appearance potential spectroscopy (APS) probes the binding energies of core levels and the local densities of unoccupied conduction band states. This technique was combined with Auger electron spectroscopy (AES) in order to determine the chemical composition of the analysed region near the surface and was applied to the study of the electronic properties of Cu/Ni and Fe/Ni alloys. In the case of Cu/Ni alloys it was demonstrated that d‐holes never enter the sites of Cu atoms, but on the other hand they exist at the Ni atoms even at high Cu concentrations. The derived variation of the density of states at the Fermi level n(EF) agrees well with theoretical results calculated by Stocks et al. using the coherent potential approximation. The variation of the Ni L3‐appearance potential with the alloy composition is qualitatively explained in terms of an intraatomic electronic reorganization process. A similar effect is observed with Fe/Ni alloys for the Ni L3‐appearance potential with Ni concentrations between 70 and 100%, whereas the Fe L3‐appearance potential remains constant over the whole concentration range. In the case of the Fe/Ni alloys no direct evaluation of n(EF) from APS data is possible.
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