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Possible geometries of cyclo[18]carbon, A–D, together with respective simulated AFM images at two different tip–sample distances, (e)–(h): Δz = 0.6 Å; (i)–(l): Δz = 0.2 Å. The AFM simulations correspond to geometries with A: d1 = d2 = 1.30 Å, θ1 = θ2 = 160°; B: d1 = 1.38 Å, d2 = 1.24 Å, θ1 = θ2 = 160°; C: d1 = d2 = 1.30 Å, θ1 = 171.4°, θ2 = 148.6°; D: d1 = 1.38 Å, d2 = 1.24 Å, θ1 = 173.1°, θ2 = 146.9°. The scale bar in (e) is 5 Å and applies to all simulated AFM images.
