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A study was made of U overlayers on polycrystalline Mg and Al by X-ray photoelectron spectroscopy (XPS) and ultra-violet photoelectron spectroscopy (UPS). On Mg, U deposits as a pure overlayer without any interdiffusion, while on Al spontaneous interdiffusion takes place. The U4f spectra of U/Mg show only weak correlation satellites. Nevertheless the asymmetrical shape of the U4f peak indicates 5f band narrowing. On Al, strong correlation satellites are observed in addition to plasmon loss features. It seams that U-substrate interactions promote correlation effects, while the reduced coordination in overlayers plays a less important role. UPS valence band (VB) spectra of the 2 systems look remarkably similar. They do not show any correlation satellites. With decreasing overlayer thickness the 5f peak narrows which is attributed to 5f band narrowing at the surface.

Additional information

Authors: GOUDER T, JRC Karlsruhe (DE)
Bibliographic Reference: Article: Surface Science (1996)
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