| http://www.w3.org/ns/prov#value | - These suggest that the surface is a smoothly corrugated soft wall with a peak-to-trough distance along the [001] direction of ~ 1 ??? and an attractive well depth of ~ 7 meV. Existing methods for generating van der Waals potentials are reviewed and an explanation is suggested for their poor performance in the case of helium.
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