THE ELECTRONIC-STRUCTURE OF AG(110)C(4X4)C-60 AND AU(110)(6X5)C-60

C-60 chemisorbs and forms ordered overlayers on both Ag(110) and Au(11 0)2 x 1: Ag(110)c(4 x 4)C-60 and Au(110)(6 x 5)C-60. We use direct (UP S) and inverse photoemission spectroscopy (IFS) to examine the occupie d and unoccupied electronic structure of Ag(110)c(4 x 4)C-60 and IFS t o examine the unoccupied electronic structure of Au(110)(6 x 5)C-60. C omparing the data with multilayer spectra we observe clear and unequiv ocable signatures of final and initial state effects in the spectra. T he final state effects take the form of screening of the ionic final s tate. Charge transfer from Ag(110) into first layer C-60 molecules is directly observed by UPS and the interaction of first layer C-60 molec ules with the substrate is further evidenced by a broadening of C-60 f eatures, ascribed to a splitting of molecular orbitals. The work funct ions of Ag(110)c(4 x 4)C-60 and Au(110)(6 x 5)C-60 are found to be equ al to that of bulk C-60. The combination of the work function measurem ents and the spectroscopy give new insights into the bonding of C-60 o n these surfaces.