Abstract
Surface core level shifts in liquid metals and alloys have been observed for the first time by photoelectron spectroscopy. In liquid Cs, the 5p 3/2 core line is shifted by 224±5 meV to higher binding energy, in close agreement with the corresponding value found in solid Cs. In AuGa alloys, the surface induced core level shifts have been analyzed at both the Au and Ga sites in the liquid and solid state. Marked changes in the relative intensities of the surface shifted core lines on melting are observed. The present results strongly support the picture of well defined atomic layers on top of a liquid metal, similar to the crystalline case with a first atomic layer exhibiting electronic surface properties and a second layer revealing basically bulk behaviour.
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