Fig. 3: Electron density distribution of Au on MgO surfaces.

Isostructural charge density difference plots of a Au/MgO(100), b Au/H-MgO(100), c Au/OH-MgO(100), d Au/Al-MgO(100), and e Au/Na-MgO(100). Blue represents depletion of electron density and green represents accumulation. The black arrows depict the flow of electrons. The isosurface level is ±0.003 e− Bohr−3.