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. 2021 Nov 10;7(46):eabj9751. doi: 10.1126/sciadv.abj9751

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Fig. 1. — (A) Three-dimensional model of the standing PTCDA molecule (black, carbon atoms; red, oxygen atoms; white, hydrogen atoms) on two Ag adatoms (blue) on the Ag(111) surface (gray). (B) STM images (−50 mV, 0.2 nA, 25 × 25 Å²) of all six observable azimuthal orientations of s-PTCDA, linked to the respective adatom dimers, D₁ (blue) or D₂ (purple). The center adatom (gray) is part of all dimers. Three D₂ dimers and six D₁ dimers with pairwise identical azimuthal orientations can form in this way. (C) Top and side views of the two observed adatom pedestals, D₁ and D₂, with adatom distances computed by PBE + vdW^surf for the bare dimer (center row) and the dimer with PTCDA attached (top row).