Fig. 2: Force spectroscopy characterization of NH and N sites on a single BI molecule and a linear chain. | Nature Communications

Fig. 2: Force spectroscopy characterization of NH and N sites on a single BI molecule and a linear chain.

From: Anomalous rotational-symmetry breaking in proton arrangement of surface-confined cyclic hydrogen bonds revealed by atomic force spectroscopy

Fig. 2

a Ball-and-stick models of BI molecules. r and l denote the NH site on the right and left side, respectively. Color code: C, grey; H, white; N, blue. b Overview STM image of BI assemblies on Ag(111). Setpoint: Us = 100 mV, It = 10 pA. c, d STM (c) (setpoint: Us = 100 mV, It = 10 pA) and AFM (d) images of a single BI molecule on Ag(111) measured with a CO-tip. e Line-FS along the dashed arrow in (d), extracted Fmin(d) curve (left projection; orange) and two F(z) curves recorded at peak positions (right projection). f Bond-resolved AFM image of a BI chain. g Zoomed-in image of (f) with scaled molecular models superimposed. h Line-FS along the dashed arrow in (g), extracted Fmin(d) curve (left projection; orange) and two F(z) curves recorded at peak positions (right projection). All the AFM images were recorded at a tip height of z = −30 pm relative to the STM setpoint (Us = 20 mV, It = 5 pA) above the bare surface. Source data are provided as a Source Data file.

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