PHOTOEMISSION-STUDIES ON PT FOIL IMPLANTED BY CARBON-ATOMS ACCELERATED IN A VAN DE GRAAFF GENERATOR - NATURE OF THE INTERACTION BETWEEN PT AND CARBON

X-ray and UV-photoelectron spectroscopies have been applied to study P t foils implanted with carbon atoms of fluxes in the range of 10(15) t o 10(18) atoms/cm(2) accelerated by a 100 keV Van de Graaff generator. Core level Pt4f and C1s X-ray photoelectron spectra do not indicate a ny charge transfer between carbon and Pt. MgK alpha and He (I) excited valence band spectra, however, allow us to conclude the presence of a weak interaction between carbon and Pt. At high flux, small, isolated Pt fragments are segregated and embedded into the carbon overlayer an d this is indicated by a change of the Fermi edge in the Pt-C system. On the other hand, at low flux larger Pt crystallites are exposed to t he surface and in addition to graphite like carbon, weak electronic in teraction can be proved based on the valence band intensities near to the Fermi level.