In-situ atomic structure of underpotentially deposited monolayers of Pb and Tl on Au(111) and Ag(111). A surface X-ray scattering study
In-situ atomic structure of underpotentially deposited monolayers of Pb and Tl on Au(111) and Ag(111). A surface X-ray scattering study
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Au(111) 和 Ag(111) 上欠电位沉积的 Pb 和 Tl 单层的原位原子结构。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
L. Sorensen
中科院分区：
文献类型：
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作者：
M. Toney;J. Gordon;M. Samant;G. L. Borges;O. Melroy;Dennis Yee;L. Sorensen
用X射线表面散射法测量了Tl和Pb在Au（111）和Ag（111）表面上的电化学欠电位沉积（UPD），旨在了解影响这些体系原子结构和可压缩性的因素。据发现，UPD沉积物形成不相称的，六边形的单层，被压缩相比，散装金属和旋转从基板方向由几度。结果表明，对于这些无公度的UPD体系，（i）吸附原子-吸附原子相互作用是决定单分子膜结构的主要作用力，（ii）虽然吸附原子-基底相互作用很强并导致单分子膜的形成，但它对单分子膜结构的影响很小，和（iii）与单层接触的大浓度水分子或吸附阴离子的存在不影响其结构。参考文献70篇，图9，1个选项卡。
In-situ surface X-ray scattering measurements are described of the electrochemical underpotential deposition (UPD) of Tl and Pb monolayers on Au(111) and Ag(111) with the aim of understanding the factors that influence the atomic structure and compressibility of these systems. It is found that the UPD deposits form incommensurate, hexagonal monolayers that are compressed compared to the bulk metals and rotated from the substrate direction by several degrees. Our results show that for these incommensurate UPD systems, (i) the adatom-adatom interaction is the primary force determining the monolayer structure, (ii) although the adatom-substrate interaction is strong and results in the formation of the monolayer, it only influences the monolayer structure slightly, and (iii) the presence of the large concentration of water molecules or adsorbing anions in contact with the monolayer does not affect its structure. 70 refs., 9 figs., 1 tab.