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. 2015 Jul 16;6:7766. doi: 10.1038/ncomms8766

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(a) Constant-height AFM image of a single PTCDA molecule adsorbed on the Si(111)-(7 × 7) surface. The acquisition parameters were f₀=158,586.6 Hz, k=31.9 N/m, A=138 Å, V_s=V_c.p.d.=130 mV, and Q=22,000. The scan speed was 3 nm s^-1. Scale bar, 0.5 nm. (b) Calculated map of electron density cut along a plane parallel to the surface. (c,d) Top and side views of the optimized configuration of the PTCDA molecule adsorbed at a corner-hole site of the Si(111)-(7 × 7) surface.