Figure 4.

(a) Conductance versus displacement traces of the molecules 2 and 3. The conductance is extracted from a linear fit of the current at low bias of each I–V measured during the stretching oh the molecular junction. (b) Two I–V curves, measured in the points indicated by the arrows in (a). The solid line corresponds to a single-level model fit to the data, the parameters of the fit are: 2 (ε₀ = 0.55 eV, Γ = 4 meV) and 3 (ε₀ = 0.71 eV, Γ = 2 meV).