Deposition of cerium on polycrystalline platinum ribbons has been stud
ied by Auger electron spectroscopy. Our data indicate that intermixing
or compound formation occurs during the deposition of Ce on Pt at roo
m temperature. However, coadsorption of oxygen, at a low level, has be
en found to change the growth process, a pseudo layer-by-layer growth
mechanism being then observed. The oxygen uptake has been followed on
these various surfaces. It strongly decreases when a Pt-Ce compound is
formed.