Coverage-dependent adsorption behavior of benzene on Si(100): A high-resolution photoemission study
Coverage-dependent adsorption behavior of benzene on Si(100): A high-resolution photoemission study
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苯在 Si(100) 上的覆盖率依赖性吸附行为：高分辨率光电子研究
DOI：
10.1103/physrevb.71.115311
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发表时间：
2005
影响因子：
3.7
通讯作者：
H. Yeom
中科院分区：
文献类型：
--
作者：
Yeongkwan Kim;M. H. Lee;H. Yeom
采用同步辐射高分辨率核能级光电子能谱和紫外光电子能谱（UPS）研究了苯分子在Si（100）上的吸附。发现苯吸附物的光电子能谱由两种不同的组分组成，它们代表有或没有直接键的碳原子。随着分子盖度的增加，这两种组分的居群比发生了剧烈的变化。这可以通过吸附质结构的覆盖依赖性变化来解释，这一点可以通过UPS观察到的价带分子轨道的明显变化来证实。从这些结果可以推断，在高覆盖度下，二结构的居群比低覆盖度下能量有利的四结构的居群显著增加。这表明了在高覆盖范围内吸附分子之间相互作用的重要性。
The adsorption of benzene molecules on Si(100) is investigated by high-resolution core-level photoelectron spectroscopy using synchrotron radiation as well as ultraviolet photoelectron spectroscopy (UPS) for valence bands. The Cphotoelectron spectra of benzene adsorbates are found to consist of two different components, which represent carbon atoms with or without a directbond. The population ratio of these two components exhibits a drastic change upon increasing the molecular coverage. This is explained by the coverage-dependent change of the adsorbate structure, which is corroborated by the noticeable variation of the molecular orbitals in the valence bands as observed by UPS. From these results, it is deduced that the population of the di-structure increases significantly at a high coverage over the tetra-structure which is energetically favored at a low coverage. This indicates the importance of the interaction between the adsorbate molecules at a high coverage.