Formation of surface ternary alloys by coadsorption of alkali metals on Al(111).
Formation of surface ternary alloys by coadsorption of alkali metals on Al(111).
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通过碱金属在 Al(111) 上的共吸附形成表面三元合金。
DOI：
10.1103/physrevlett.76.1892
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发表时间：
1996
影响因子：
8.6
通讯作者：
Adams
中科院分区：
文献类型：
--
作者：
Christensen;Nerlov;Nielsen;Burchhardt;Adams
在300 K时，四分之一单层Na与四分之一单层K、Rb或Cs在Al（111）表面的共吸附导致形成具有（2× 2）晶胞的表面三元合金。核心电子结合能的化学位移和低能电子衍射的定量分析表明，前四个表面层包括在每种情况下的X-Al-Na三明治（X K，Rb，或Cs）的重建Al基板层。夹层的下层总是含有钠，无论吸附顺序。
Coadsorption of one-quarter monolayer Na with one-quarter monolayer K, Rb, or Cs on Al (111) at 300 K is shown to result in the formation of surface ternary alloys with (2× 2) unit cells. Chemical shifts in core electron binding energies and quantitative analyses by low energy electron diffraction indicate that the first four surface layers consist in each case of an X-Al-Na sandwich (X≡ K, Rb, or Cs) on a reconstructed Al substrate layer. The lower layer of the sandwich always contains Na, irrespective of the adsorption sequence.