Adsorption and charge transfer interactions of bi-isonicotinic acid on Ag(111).
Adsorption and charge transfer interactions of bi-isonicotinic acid on Ag(111).
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双异烟酸在 Ag(111) 上的吸附和电荷转移相互作用。
DOI：
10.1063/1.4996746
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
J. O'Shea
中科院分区：
文献类型：
--
作者：
Robert H. Temperton;Andrew J Gibson;Karsten Handrup;J. O'Shea
使用基于同步辐射的光电子发射、X射线吸收和共振核光谱研究了有机分子双异烟酸（4,4-二羧基-2,2-联吡啶）在单晶Ag（111）上的吸附和电荷转移动力学。多层和单层覆盖率的测量用于确定分子-表面相互作用的性质和分子取向。通过结合 N 1s 边缘的 X 射线吸收光谱和价态光电发射来分别测量未占据和占据的价态，获得单层相对于下面金属表面的实验态密度。这表明核心激发态的最低未占据分子轨道在能量上位于表面的费米能级以下，允许电荷从金属转移到该轨道。共振光电子能谱用于在超级观察者和超级俄歇电子跃迁的背景下探测这种电荷转移。所提出的结果为共振核级光谱提供了一种新颖的解释，通过观察金属表面的电子在核激发分子的核-空穴衰变中发挥直接作用，探索吸附的有机分子和金属表面之间的超快电荷转移。
The adsorption and charge transfer dynamics of the organic molecule bi-isonicotinic acid (4,4-dicarboxy-2,2-bipyridine) on single crystal Ag(111) has been studied using synchrotron radiation-based photoemission, x-ray absorption, and resonant core spectroscopies. Measurements for multilayer and monolayer coverage are used to determine the nature of the molecule-surface interactions and the molecular orientation. An experimental density of states for the monolayer with respect to the underlying metal surface is obtained by combining x-ray absorption spectroscopy at the N 1s edge and valence photoemission to measure the unoccupied and occupied valence states, respectively. This shows that the lowest unoccupied molecular orbital in the core-excited state lies energetically below the Fermi level of the surface allowing charge transfer from the metal into this orbital. Resonant photoelectron spectroscopy was used to probe this charge transfer in the context of super-spectator and super-Auger electron transitions. The results presented provide a novel interpretation of resonant core-level spectroscopy to explore ultra-fast charge transfer between an adsorbed organic molecule and a metal surface through the observation of electrons from the metal surface playing a direct role in the core-hole decay of the core-excited molecule.
影响因子：
8.4
作者：
Cebula, Izabela;Lu, Hao;Buck, Manfred
通讯作者：
Buck, Manfred