INTRAMOLECULAR FEATURES OF INDIVIDUAL C-60 MOLECULES ON SI(100) OBSERVED BY STM

Intramolecular features (IMF) of a variety of individual C-60 molecule s adsorbed on an Si(100)-(2 x 1) surface have been imaged by scanning tunneling microscopy under ultrahigh vacuum conditions. Features of in dividual C-60 molecules clearly show the local density of states super imposed on their cage structure. Both physisorbed (pre-annealed) and c hemisorbed (post-annealed) species have been imaged on the same surfac e, exhibiting characteristics that depend on their bonding nature. Int ramolecular features of a physisorbed C-60 molecule and of two chemiso rbed molecules are presented.