Elsevier

Surface Science

Volume 222, Issues 2–3, 3 November 1989, Pages 451-463
Surface Science

Adsorbate induced reconstruction by strong chemisorption: Ru(001)p(2×2)-O

https://doi.org/10.1016/0039-6028(89)90371-3Get rights and content

Abstract

The oxygen induced p(2 × 2) structure at a coverage of θ = 0.25 on Ru(001) was investigated by LEED IV analysis, evaluating four non-equivalent integral and six fractional order LEED beams at normal incidence. Oxygen was found to adsorb on the threefold coordinated hcp site. However, satisfactory agreement with experimental data could only be achieved by reconstructing the substrate in the first two layers. Both layers are buckled by 0.07 and 0.08 ± 0.03 Å, respectively. Ru atoms directly bound to oxygen move also laterally away from oxygen by 0.09 ± 0.05 Å, so that a O-Ru bond length of 2.03 ± 0.06 Å results. A different reconstruction and an essentially identical bond length has been found before for half coverage [Pfnür et al., Surface Sci. 220 (1989) 43].

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