Mapping the Electronic Resonances of Single Molecule STM Tunnel Junctions

In this chapter is presented how the electron probability distributions of molecular states are imaged in real space using scanning tunneling microscopy. Differential tunneling conductance images of selected single molecules taken at voltages corresponding to resonances near the substrate Fermi level were found to be very close to their respective mono-electronic molecular orbitals. In contrast, high-order resonance states images were composed of molecular orbitals components from many states, even though those states lie in a lower energy range.