A SCANNING-TUNNELING-MICROSCOPY STUDY OF THE ADSORPTION OF XE ON PT(111) UP TO ONE MONOLAYER
A SCANNING-TUNNELING-MICROSCOPY STUDY OF THE ADSORPTION OF XE ON PT(111) UP TO ONE MONOLAYER
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DOI：
10.1007/bf01538240
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发表时间：
1995-02-01
影响因子：
2.7
通讯作者：
COMSA, G
中科院分区：
文献类型：
--
作者：
HORCH, S;ZEPPENFELD, P;COMSA, G
本文用变温扫描隧道显微镜（STM）研究了Pt（111）表面从原子到达到形成单分子层的吸附过程。令人惊讶的是，在吸附的初始阶段，铂优先结合到低配位位点，铂台阶的上边缘。与这些位点的强结合导致与进一步的双原子的局部排斥相互作用。因此，位于台阶上边缘的铂原子不作为2D铂岛的核，而是形成在台阶上和铂台阶的下边缘。只有在完成的单分子层做这些岛屿接触的原子吸附在开始时在上边缘的位置。完整的单分子层显示出从早期的氦衍射实验中已知的Hiscononal无公度旋转（HIR）相。
The adsorption of Xe on Pt(111) has been investigated from the arrival of the very first atoms up to completion of the monolayer using a variable-temperature Scanning Tunneling Microscope (STM). Surprisingly, in the initial stages of the adsorption Xe preferentially binds to a low coordination site, the upper edge of the platinum steps. The strong binding to these sites leads to a local repulsive interaction with further Xe atoms. Therefore, the Xe atoms located at the upper edge of the steps do not serve as nuclei for 2D Xe islands, which, instead, form on the terraces and at the lower edges of the platinum steps. Only during completion of the monolayer do these islands make contact with the atoms adsorbed at the beginning in the upper-edge positions. The full monolayer exhibits the Hexagonal Incommensurate Rotated (HIR) phase already known from earlier helium-diffraction experiments.