The energetics of water on oxide surfaces by quantum Monte Carlo

Details The energetics of water on oxide surfaces by quantum Monte Carlo The energetics of water on oxide surfaces by quantum Monte Carlo

2006-01-25

arxiv.org/abs/cond-mat/0601572v2

Physics

Condensed Matter

Materials Science

5 pages, 2 figures

Scientific paper

Density functional theory (DFT) is widely used in surface science, but gives poor accuracy for oxide surface processes, while high-level quantum chemistry methods are hard to apply without losing basis-set quality. We argue that quantum Monte Carlo techniques allow these difficulties to be overcome, and we present diffusion Monte Carlo results for the formation energy of the MgO(001) surface and the adsorption energy of H$_2$O on this surface, using periodic slab geometry. The results agree well with experiment. We note other oxide surface problems where these techniques could yield immediate progress.

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