Physisorption of helium on a TiO2(110) surface: Periodic and finite cluster approach

As a proto-typical case of physisorption on an extended transition-metal oxide surface, the interaction of a helium atom with a TiO2(110)-(1 x 1) surface is studied here by using finite cluster and periodic approaches and both wave-function-based (post Hartree-Fock) quantum chemistry methods and density functional theory. Both classical and advanced finite cluster approaches, based on localized Wannier orbitals combined with one-particle embedding potentials, are applied to provide (reference) coupled-cluster and second-order Moller-Plesset interaction energies. It is shown that, once the basis set is specifically tailored to minimize the basis set superposition error, periodic calculations using the Perdew-Burke-Ernzerhof functional yield short and medium-range interaction potentials in very reasonable agreement with those obtained using the correlated wave-function-based methods, while small long-range dispersion corrections are necessary to reproduce the correct asymptotic behavior. This study is aimed at a subsequent simulation of helium mediated deposition on oxide surfaces.Our research was supported by de CSIC-CM, MICINN-CSIC, MICINN and CM Spanish Grant: Nos. CCG08-CSIC/ESP-3680, PIE,2007501004, FIS2010-18132 and S2009-MAT-1467. We also acknowledge the support from the program CONSOLIDER-INGENIO 2010 under Grant CSD2009-00038 and the COST Action CM11002. N.F.A. thanks a predoctoral JAE felowship from the CSIC.Peer Reviewe

Physisorption of helium on a TiO2(110) surface: Periodic and finite cluster approaches

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