Fig.1 from "The Chemical Structure of a Molecule Resolved by Atomic Force Microscopy."

"STM and AFM imaging of pentacene on Cu(111). (A) Ball-and-stick model of the pentacene molecule. (B) Constant-current STM and (C and D) constant-height AFM images of pentacene acquired with a CO-modified tip. Imaging parameters are as follows: (B) set point I = 110 pA, V = 170mV; (C) tip height z = –0.1 Å [with respect to the STM set point above Cu(111)], oscillation amplitude A = 0.2 Å; and (D) z = 0.0Å, A = 0.8 Å. The asymmetry in the molecular imaging in (D) (showing a “shadow” only on the left side of the molecules) is probably caused by asymmetric adsorption geometry of the CO molecule at the tip apex."