ULTRAVIOLET AND ELECTRON-RADIATION INDUCED FRAGMENTATION OF ADSORBED FERROCENE

From thermal desorption spectroscopy we find that ferrocene, Fe(C5H5)( 2), adsorbs and desorbs associatively on Ag(100). Photoemission result s indicate that the initially adsorbed surface species closely resembl es that of molecular ferrocene. The shift in photoemission binding ene rgies relative to the gas phase is largely independent of the molecula r orbital. We find that ultraviolet light does lead to partial fragmen tation of the ferrocene and that the molecular fragments are much more strongly bound to the surface than the associatively adsorbed ferroce ne. Since fragmentation occurs only in the presence of incident radiat ion, selective area deposition from this class of molecules is possibl e. Using a focused electron beam in a scanning transmission electron m icroscope, we show that selective area deposition of features with res olution of a few hundred angstroms is readily achieved. (C) 1994 Ameri can Institute of Physics.