The electronic structure of epitaxial C60 films grown on Ag(110) has been thoroughly investigated by means of high-resolution photoemission and X-ray absorption spectroscopy. The epilayer is obtained by annealing high-coverage fullerene films at selected temperatures (400 and 500°C). The adlayer-substrate interaction is proven to be dominated by ionic character with a sizeable charge transfer as indicated by the partial filling up of the ?*-Derived LUMO orbitals. An apparent discrepancy in the estimate of the LUMO occupancy is found when comparing our results with scanning tunnelling spectroscopy (STS) measurements. This effect is interpreted in terms of the differing surface sensitivity of the two spectroscopies (STS versus XPS).
Substrate-adlayer interaction at the C60/Ag(110) interface studied by high-resolution synchrotron radiation
E Magnano;C Cepek;
1997
Abstract
The electronic structure of epitaxial C60 films grown on Ag(110) has been thoroughly investigated by means of high-resolution photoemission and X-ray absorption spectroscopy. The epilayer is obtained by annealing high-coverage fullerene films at selected temperatures (400 and 500°C). The adlayer-substrate interaction is proven to be dominated by ionic character with a sizeable charge transfer as indicated by the partial filling up of the ?*-Derived LUMO orbitals. An apparent discrepancy in the estimate of the LUMO occupancy is found when comparing our results with scanning tunnelling spectroscopy (STS) measurements. This effect is interpreted in terms of the differing surface sensitivity of the two spectroscopies (STS versus XPS).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
