HREELS and XPS Studies of Ferrocene on Ag(100)

High-resolution electron energy loss spectroscopy (HREELS) and X-ray photoelectron spectroscopy (XPS) have been used to investigate the adsorption of ferrocene on Ag(100) at 150 K. The HREELS data show that ferrocene adopts an orientation with the molecular axis perpendicular to the Ag(100) surface plane for low exposures. Additionally, no rehybridization is observed at the low temperature employed. Upon multilayer growth, however, the molecular axis becomes canted with respect to the surface normal. XPS for monolayer ferrocene gives Fe 2p binding energies of 707.9 and 720.8 eV for the 2p 3/2 and 2p 1/2 transitions, respectively, and C 1s binding energy of 284.9 eV. Monolayer surface coverage represents a molecular footprint of about one ferrocene per nine Ag surface atoms. Multilayer ferrocene grows in a layer-by-layer fashion and shows HREELS and XPS