期刊
SURFACE SCIENCE
卷 543, 期 1-3, 页码 19-28出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2003.08.001
关键词
chemisorption; hydrides; surface structure, morphology, roughness, and topography; low energy electron diffraction (LEED); palladium
We examine the effects of chemisorbed organic molecules on the intensity versus beam energy (I/E) variation of the substrate (1 x 1) Bragg spots in low energy electron diffraction (LEED). We find that these integer-order spots alone can provide important information about the local geometries of the molecules on the surface, largely independent of the degree of long-range order of an adsorbate overlayer. This is demonstrated by comparing LEED studies of two different adsorbates on Pd(1 1 1), namely: G(2)H(2) which forms an ordered (root3 x root3)R30degrees overlayer, and thus gives rise to superstructure (or fractional-order) Bragg spots, and disordered CH3OH, which scatters diffusely into directions between the integer-order spots. This allows LEED to be used conveniently for the determination of the structures of adsorbates on surfaces as a continuous function of coverage, independent of the degree of long-range order of the adlayer. (C) 2003 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据