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Surface segregation and core-level shift of a Pd---Rh alloy studied by XPS |
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| Authors: | J A Leiro M H Heinonen I G Batirev |
| Institution: | a Department of Applied Physics, University of Turku, Itäinen Pitkäkatu 1, FIN-20520, Turku, Finland b Department of Solid State Physics, Moscow State University, 119899, Moscow, Russia |
| Abstract: | The surface core-level shift and surface segregation of a Pd93Rh7 alloy have been considered in the light of X-ray photoemission spectroscopy. A core-level shift of the Pd3d line to a lower binding energy as far as the surface atoms are concerned has been observed, which can be expected on the basis of the Z + 1 approximation. Also, surface segregation of Pd atoms has been found by using different take-off angles between the momentum of the escaping photoelectron and the surface of the Pd---Rh alloy. This effect has been discussed in terms of the surface density of electronic states and the d-band occupancy of an alloy. |
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