Fig. 4: Diffusion study of MoMo on calcite (10.4).
From: Creating a regular array of metal-complexing molecules on an insulator surface at room temperature
a, b Two consecutive AFM images with a time lapse of 16 min of the same area. c Difference image of the images shown in a and b, illustrating that 8 (marked by black circles) out of 241 molecules change position along the \(\left[ {42\bar 1} \right]\) direction. In contrast, no molecules are found to move along the \(\left[ {0\bar 10} \right]\) direction, which constitutes a clear sign of anisotropic diffusion. Blue and red colors label disappearing and appearing features, respectively. The sequence of three changes (blue, red, blue or red, blue, red) is a consequence of the fact that the molecules show a depression to the left.
