Journalartikel

Jahr der Veröffentlichung: 1994

Seiten: 1-10

Zeitschrift: Surface Science

Bandnummer: 301

Heftnummer: 1-3

DOI Link: https://doi.org/10.1016/0039-6028(94)91282-3

Verlag: Elsevier

Abstract: 

Sodium adsorbed on the Ru(0001) surface below room temperature forms a number of ordered phases, commensurate as well as incommensurate. They are investigated by low-energy electron-diffraction (LEED) and work-function measurements (Δφ). The structural analyses for the p(2 × 2)-, (√3 × √3)R30°- and (3 × 3)-phases at coverages of 14,31and49, respectively, reveal coverage-dependent adsorption sites. As for K adsorbed on Ru(0001), Na atoms occupy threefold fcc-sites in the p(2 × 2) phase while for the (√3 × √3)R30° phase the hcp site is favoured. A structural analysis of the (3 × 3) phase, including 4 adsorbate atoms within the unit cell, revealed that nearest-neighbour distances are maximized at the cost of occupying low symmetry sites. This conclusion is supported by comparison of relative theoretical and experimental adsorbate-induced spot intensities. For all three phases the Na hard-sphere radii are nearly the same and close to the covalent Pauling radius.

Harvard-Zitierstil: Hertel, T., Over, H., Bludau, H., Gierer, M. and Ertl, G. (1994) Na adsorption on Ru(0001): a low-energy electron-diffraction analysis of three ordered phases, Surface Science, 301(1-3), pp. 1-10. https://doi.org/10.1016/0039-6028(94)91282-3

APA-Zitierstil: Hertel, T., Over, H., Bludau, H., Gierer, M., & Ertl, G. (1994). Na adsorption on Ru(0001): a low-energy electron-diffraction analysis of three ordered phases. Surface Science. 301(1-3), 1-10. https://doi.org/10.1016/0039-6028(94)91282-3