Diffusion of N adatoms on the Fe(100) surface

M. Ø. Pedersen, L. Österlund, Jens Jørgen Mortensen, Manos Mavrikakis, Lars Bruno Hansen, I. Stensgaard, E. Lægsgaard, Jens Kehlet Nørskov, Flemming Besenbacher

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The diffusion of individual N adatoms on Fe(100) has been studied using scanning tunneling microscopy and ab initio density functional theory (DFT) calculations. The measured diffusion barrier for isolated N adatoms is E-d = (0.92 +/- 0.04) eV, with a prefactor of nu(0) = 4.3 x 10(12) s(-1), which is in quantitative agreement with the DFT calculations. Thr; diffusion is strongly coupled to lattice distortions. and. as a consequence, the presence of other N adatoms introduces an anisotropy in the diffusion. Based on experimentally determined values of the diffusion barriers and adsorbate-adsorbate: interactions, the potential energy surface experienced by a N adatom is determined.
Original languageEnglish
JournalPhysical Review Letters
Issue number21
Pages (from-to)4898-4901
Publication statusPublished - 2000

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Copyright (2000) American Physical Society


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