Terthiophene on Au(111): A scanning tunneling microscopy and spectroscopy study

• Berndt Koslowski,
• Anna Tschetschetkin,
• Norbert Maurer,
• Elena Mena-Osteritz,
• Peter Bäuerle and
• Paul Ziemann

Beilstein J. Nanotechnol. 2011, 2, 561–568, doi:10.3762/bjnano.2.60

• separation of the molecules from the surface of 0.315 nm [20]. Such a considerable difference requires an explanation. Typically one would argue in STM that a change of the density of states (DOS) or the barrier height, Φ, above a molecule changes the tip–sample separation. However, the spatial distribution

• = +2.26 eV and a width of 0.71 eV, which corresponds to a lifetime of electrons in the LUMO of ~0.5 fs. The spatial distribution of electronic states at an energy E can be imaged by measuring the conductivity of the tunneling junction simultaneously with topography at a given bias Vt = E and a bias

• HOMO, respectively. Also shown is a Lorentzian fitted (black curve) to the positive branch on the molecule (center 2.26 eV, width 0.71 eV corresponding to a lifetime of ~0.5 fs). (a) and (e) shape of single 3T molecule on Au(111) (2 × 2 × 0.15) nm3, (b) and (f) ∂VI maps showing the spatial distribution