COMPLETE ELECTRONIC-STRUCTURE OF ORIENTED FILMS OF HEXATRIACONTANE

We have employed angle-resolved direct and inverse photoemission spectroscopy to study the electronic structure of oriented monolayers of hexatriacontane CH3(CH2)34CH3 on Cu (111). Using dipole selection rules we conclude that these polyethylene model compounds tie flat on the copper surface. The valence bands determined experimentally are compared to the known one-dimensional electronic band structure of the linear chain molecule. Two unoccupied molecular states are measured for the first time and comparison to recent calculations within the extended Huckel method identifies them as the lowest unoccupied molecular orbitals.