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8 pages.-- PACS nrs.: 68.43.Mn, 82.65.+r, 82.30.Lp.We study the dissociative adsorption of N2 on W(100) and W(110) by means of density functional theory and classical dynamics. Working with a full six-dimensional adiabatic potential energy surface (PES), we find that the theoretical results of the dynamical problem strongly depend on the choice of approximate exchange-correlation functional for the determination of the PES. We consider the Perdew-Wang-91 [Perdew et al., Phys. Rev. B 46, 6671 (1992)] and Perdew-Burke-Ernzerhof (RPBE) [Hammer et al., Phys. Rev. B 59, 7413 (1999)] functionals and carry out a systematic comparison between the dynamics determined by the respective PESs. Even though it has been shown in earlier works that the RPBE may provide better values for the chemisorption energies, our study brings evidence that it gives rise to a PES with excessive repulsion far from the surface.We acknowledge partial support by the Spanish Ministerio de Educación y Ciencia (Grant No. FIS2007-66711-C02-02). Computational resources were provided by the SGI/IZO-SGIker at the UPV/EHU (supported by the Spanish Ministerio de\udEducación y Ciencia and the European Social Fund) and the DIPC computer center.Peer reviewe

The role of exchange-correlation functionals in the potential energy surface and dynamics of N2 dissociation on W surfaces