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. 2021 Jan 15;12:398. doi: 10.1038/s41467-020-20427-2

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© The Author(s) 2021

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Fig. 9 — a Relative energy and b sum of forces acting on the Au₂ cluster for the cluster adsorbed at the MgO(001) substrate for the non-wetting geometry for the Al-doped and undoped cases. The local minima of the energy curves are marked with a dot. The Au–O bond-length refers to the distance between the Au closest to the surface and its neighboring oxygen atom.