Extended Data Fig. 8: Determination of the tip–molecule distance.
From: Orbital-resolved visualization of single-molecule photocurrent channels
a, The conductance (G) curve for the bare Ag(111) (black) and the linear fitting curve (red). The tip displacement Z refers to the initial tip position at Vs = −2.5 V and It = 3 pA. The G is normalized by the quantization conductance G0 which is defined by 2e2/h with the electron charge e and Planck’s constant h. b, A schematic illustration of the various relevant distances in the photocurrent measurement.
