Abstract
A truncated Fourier decomposition of the atom–substrate potential energy is developed for three-dimensional models of van der Waals systems, specifically for adsorption on the basal plane surface of graphite or the (111) face of a face-centered-cubic lattice. This provides a framework for analysis of a priori calculations of physical adsorption energies.
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Notes
The Ar/graphite example [17] discussed in Sect. III. A has \(V_{g_0}\,=\,-0.222\) and \(V_{\sqrt{3} g_0}\,=\,-0.403\) meV. Then, according to Eq. (26), the bridge site remains a saddle point on the potential energy surface. The maxima (1.33 meV) of the 2D surface are at positions that are not high-symmetry points of the unit cell: \({ r} \simeq 0.391 { a}_1, 0.609 { a}_1, 0.391 { a}_2, 0.609 { a}_2,\ldots \).
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Bruch, L.W. Approximating the 3D Character of a Van Der Waals Atom–Solid Potential. J Low Temp Phys 185, 122–128 (2016). https://doi.org/10.1007/s10909-016-1613-x
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DOI: https://doi.org/10.1007/s10909-016-1613-x