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首页> 外文期刊>Physical review >Valence band photoemission from the Zn-phthalocyanine/Ag(110) interface: Charge transfer and scattering of substrate photoelectrons
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Valence band photoemission from the Zn-phthalocyanine/Ag(110) interface: Charge transfer and scattering of substrate photoelectrons

机译：Zn-酞菁/ Ag（110）界面的价带光发射：衬底光电子的电荷转移和散射

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L. Giovanelli;P. Amsalem;T. Angot;L. Petaccia;S. Gorovikov;L. Porte;A. Goldoni;J.-M. Themlin;%The electronic properties of Zn-phthalocyanine vacuum deposited on Ag(110) are studied by high-resolution valence-band photoelectron spectroscopy. Submonolayer, one ordered monolayer, and molecular layers of increasing thickness present spectral features that can be related to the molecule-substrate interaction as well as to the effect of the overlayer on the escape conditions of the substrate photoelectrons. For the first-ordered molecular layer, an interface state related to a charge transfer from the substrate to the molecules is detected through the appearance of a new feature at low binding energy. Such feature, appearing already at submonolayer coverage, is interpreted as the partial filling of the lowest unoccupied molecular orbital (LUMO) and to possible hybridization of the LUMO with substrate states. Because it is the major change observed in the molecular electronic structure after adsorption, the filling of the LUMO is likely to have a major role in the molecular chemisorption. The spectral line shape of the filled part of the LUMO is discussed in terms of electron-vibron coupling and electron correlation effects. Molecular states lying at higher binding energy show spectral modifications as a function of coverage implying a weaker contribution in the molecule-substrate interaction. Important changes are found in the spectral region of the Ag 4d band after the deposition of a submonolayer and as a function of coverage although no interface states are detected. It is shown that these features can be entirely explained by considering the effect of the molecular overlayer on the escape conditions of the substrate photoelectrons. The major effect is the emerging of the substrate three-dimensional density of states. Such evidence is not simply related to the present case but it is expected to apply to other systems where an organic layer is deposited on a single-crystal substrate.
机译：L.乔瓦内利; P。 Amsalem; T。安格特; L。佩塔恰; S。戈罗维科夫; L。门; A。 Goldoni; J.-M。通过高分辨率价带光电子能谱研究了真空沉积在Ag（110）上的Zn-酞菁的电子性质。亚单分子层，一层有序单分子层和厚度​​增加的分子层具有光谱特征，这些光谱特征可能与分子与底物的相互作用以及覆盖层对底物光电子逃逸条件的影响有关。对于一阶分子层，通过以低结合能出现新特征来检测与电荷从基板转移到分子有关的界面状态。已经出现在亚单层覆盖范围内的这种特征被解释为最低的未占据分子轨道（LUMO）的部分填充以及LUMO与底物状态的可能杂交。由于这是吸附后分子电子结构中观察到的主要变化，LUMO的填充可能在分子化学吸附中起主要作用。讨论了LUMO填充部分的光谱线形状，涉及电子-电子耦合和电子相关效应。处于较高结合能的分子状态显示光谱变化是覆盖率的函数，这暗示着分子与底物相互作用的贡献较弱。尽管未检测到界面态，但是在沉积亚单分子层之后，在Ag 4d谱带的光谱区域中发现了重要的变化，并且该变化是覆盖率的函数。通过考虑分子覆盖层对衬底光电子逃逸条件的影响，可以完全解释这些特征。主要作用是出现衬底的三维状态密度。这样的证据不仅与当前情况有关，而且有望应用于在单晶衬底上沉积有机层的其他系统。

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  • 来源
    《Physical review》 |2010年第12期|p.125431.1-125431.8|共8页
  • 作者

    L. Giovanelli; P. Amsalem; T. Angot; L. Petaccia; S. Gorovikov; L. Porte; A. Goldoni; J.-M. Themlin;

  • 作者单位

    Aix-Marseille Universite, IM2NP, Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France CNRS, IM2NP (UMR 6242), Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France;

    rnAix-Marseille Universite, IM2NP, Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France CNRS, IM2NP (UMR 6242), Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France PIIM, UMR 6633, CNRS-Universite de Provence, Campus de Saint-Jerome, Avenue l'Escadrille Normandie-Niemen-Case 241, 13397 Marseille Cedex 20, France Institut fur Physik, Humboldt-Universitat zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany;

    rnPIIM, UMR 6633, CNRS-Universite de Provence, Campus de Saint-Jerome, Avenue l'Escadrille Normandie-Niemen-Case 241, 13397 Marseille Cedex 20, France;

    rnSincrotrone Trieste S.C.p.A., Strada Statale 14 km 163.5, I-34149 Trieste, Italy;

    rnSincrotrone Trieste S.C.p.A., Strada Statale 14 km 163.5, I-34149 Trieste, Italy Canadian Light Source Inc., University of Saskatchewan, 101 Perimeter Road, Saskatoon, SK, Canada S7N 0X4;

    rnAix-Marseille Universite, IM2NP, Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France CNRS, IM2NP (UMR 6242), Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France;

    rnSincrotrone Trieste S.C.p.A., Strada Statale 14 km 163.5, I-34149 Trieste, Italy;

    Aix-Marseille Universite, IM2NP, Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France CNRS, IM2NP (UMR 6242), Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F.13397 Marseille Cedex 20, France;

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  • 关键词

    polymers; organic compounds; electron states at surfaces and interfaces; polymers and organic compounds; adsorbed layers and thin films;

    机译：聚合物有机化合物;表面和界面的电子态;聚合物和有机化合物;吸附层和薄膜;

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