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Titolo:
Ordered mixed surface structures formed on Cu(001) by coadsorption of dissimilar metals: (2 root 2x root 2)R45 degrees by Mg and Li, and (root 5x root 5)R26.7 degrees by Mg and K(Cs)
Autore:
Chen, MS; Mizuno, S; Tochihara, H;
Indirizzi:
Kyushu Univ, Dept Mol & Mat Sci, Kasuga, Fukuoka 8168580, Japan Kyushu Univ Kasuga Fukuoka Japan 8168580 , Kasuga, Fukuoka 8168580, Japan
Titolo Testata:
SURFACE SCIENCE
fascicolo: 3, volume: 486, anno: 2001,
pagine: L480 - L488
SICI:
0039-6028(20010710)486:3<L480:OMSSFO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
C(2X2) PHASES; ALKALI-METALS; ADSORPTION; LEED; CU(100); NA;
Keywords:
copper; alkali metals; alkaline earth metals; alloys; low energy electron diffraction (LEED); surface structure, morphology, roughness, and topography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Tochihara, H Kyushu Univ, Dept Mol & Mat Sci, Kasuga Kouen 6-1, Kasuga, Fukuoka 8168580, Japan Kyushu Univ Kasuga Kouen 6-1 Kasuga Fukuoka Japan 8168580 pan
Citazione:
M.S. Chen et al., "Ordered mixed surface structures formed on Cu(001) by coadsorption of dissimilar metals: (2 root 2x root 2)R45 degrees by Mg and Li, and (root 5x root 5)R26.7 degrees by Mg and K(Cs)", SURF SCI, 486(3), 2001, pp. L480-L488

Abstract

The coadsorption of Mg and alkali-metals (Li, K or Cs) on Cu(001) at room temperature has been studied by low-energy electron diffraction (LEED). A (2 root2 x root2)R45 degrees structure is formed by Mg and Li at coverages both about 0.25 ML, and which has been determined by a tensor LEED analysis. It is an ordered mixed phase, in which Mg atoms are located in fourfold substitutional sites and Li atoms occupy fourfold surface hollow sites, forming alternative one-dimension-like atomic rows along the [0 1 0] direction. On the other hand, a (root5 x rootS)R26.7 degrees structure is formed by the coadsorption of Mg with either K or Cs at coverage about 0.2 ML each. These structures have also been determined: Mg atoms are in fourfold substitutional sites, while K (Cs) atoms are on surface hollow sites, forming squarearrangements of Mg and K (Cs). It is found that the top layer Cu atoms in both ordered structures are displaced laterally, and that Mg atoms are located at deeper positions in fourfold substitutional sites than in a c(2 x 2)substitutional structure formed by individual Mg adsorption. The reason far the formation of the ordered mired surface structures is discussed. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 04/12/20 alle ore 08:23:18