Figure 2.

Comparison of experimental STM and STHM images (a, c) with a simulated STM image (b) of the K₂PTCDA phase. The main features originate from the PTCDA molecules, while the K atoms cause small single dots in STHM only. Note that in conventional STM (a) the features are smeared out; PTCDA and K cannot be distinguished. The adsorbate unit cell (orange boxes) comprising the structural model is superimposed in a semitransparent manner. The applied tunneling parameters V_T (bias voltage), I_SP (tunneling current), and ρ_iso (isovalue of the integrated density of states) are indicated.