The adsorption geometry of the (2 x 1)-20 oxygen phase formed on the Co(10̅10) 
surface

Gierer, M.; Over, Herbert; Rech, P.; Schwarz, E.; Christmann, K.

doi:10.1016/S0039-6028(96)01202-2

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The adsorption geometry of the (2 x 1)-20 oxygen phase formed on the Co(10̅10) surface

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Gierer, M.
Fritz Haber Institute, Max Planck Society;

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Over, Herbert
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Gierer, M., Over, H., Rech, P., Schwarz, E., & Christmann, K. (1997). The adsorption geometry of the (2 x 1)-20 oxygen phase formed on the Co(10̅10) surface. Surface Science, 370(2-3), L201-L206. doi:10.1016/S0039-6028(96)01202-2.

Cite as: https://hdl.handle.net/21.11116/0000-0008-A1A2-A

Abstract

The bond geometry of the (2 x 1)-20-p2mg overlayer on Co(10̅10) was determined by analyzing low-energy electron diffraction (LEED) intensity data. Oxygen occupies the three-fold coordinated hcp site along the densely packed rows on the unreconstructed surface. The O atoms are attached to two atoms in the first Co layer and to one Co atom in the second layer. The strong interaction between O and Co is indicated by the bond lengths of 1.83±0.10Å and 1.99±0.10Å to the top-layer Co and the Co atoms in the second layer, respectively. The most striking result of our work is that oxygen adsorption causes a marked expansion (by 25%) of the first Co layer spacing (0.90 Å) with respect to the bulk value of 0.72 Å. This strong expansion might offer diffusion channels for O atoms to penetrate further into the subsurface region.