Sequence of scanning tunneling microscopy images of Au adatoms (circular protrusions) on NaCl(2ML)/Cu(111). Two initially neutral Au adatoms (marked by red arrows) were deliberately charged negatively and that initiated their diffusion.

From the article:

Charge-State-Dependent Diffusion of Individual Gold Adatoms on Ionic Thin NaCl Films
Jascha Repp, Wolfram Steurer, Ivan Scivetti, Mats Persson, Leo Gross, and Gerhard Meyer
Phys. Rev. Lett. 117, 146102 (2016)

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