Journalartikel

Jahr der Veröffentlichung: 1993

Seiten: 5572-5578

Zeitschrift: Physical Review B

Bandnummer: 48

Heftnummer: 8

ISSN: 0163-1829

DOI Link: https://doi.org/10.1103/PhysRevB.48.5572

Verlag: American Physical Society

Abstract: 

The type of growth and the local geometry of magnesium adsorbed on Ru(0001) were investigated by low-energy electron diffraction (LEED), work-function measurements, and thermal-desorption spectroscopy. Despite the large initial dipole moment of 4.5 D the LEED pattern revealed a hexagonal superstructure even at low global Mg coverage (θMg≥0.05) with local coverage θMg=0.65 indicating island growth. In contrast to most alkali-metal/metal systems, where liquidlike adlayers are formed for coverages lower than 0.25, the repulsive dipole-dipole interaction is overcompensated by the overlap of wave functions due to the existence of two valence electrons. During completion of the first monolayer (θMg=0.75) the hexagonal superstructure is slightly compressed along the high-symmetry directions of the Ru substrate. This compression is completed when the Mg-Mg distance reaches the corresponding bulk value. Further deposition of Mg leads to a multilayer growth (most likely layer by layer). For such an epitaxially grown, 9-ML thick Mg film on Ru(0001), a LEED structural analysis was performed which revealed Mg bulklike values for the interlayer spacings.

Harvard-Zitierstil: Over, H., Hertel, T., Bludau, H., Pflanz, S. and Ertl, G. (1993) Epitaxial growth of magnesium on Ru(0001), Physical Review B, 48(8), pp. 5572-5578. https://doi.org/10.1103/PhysRevB.48.5572

APA-Zitierstil: Over, H., Hertel, T., Bludau, H., Pflanz, S., & Ertl, G. (1993). Epitaxial growth of magnesium on Ru(0001). Physical Review B. 48(8), 5572-5578. https://doi.org/10.1103/PhysRevB.48.5572