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IR spectroscopy of adsorbates on ultrathin metal films

机译:超薄金属膜上吸附物的红外光谱

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摘要

Metal films with thickness in the nanometer range are optically transparent. With IR transmittance spectroscopy the in-plane film conductivity with its correlation to the film-growth process can be studied without electrical contacts and, on metal-island films, adsorbate vibrations can be observed because of surface enhanced IR absorption (SEIRA). Their analysis enables insight into the adsorbate-metal bonding and therefore gives information on the available adsorption sites and the crystalline facets correlated to. As in IR reflection absorption spectra dipole-dipole interaction of molecules on different sites modifies the vibration lines according to the degree of disorder ("atomic roughness"). Depending on that roughness IR spectra of adsorbate vibrations may be further modified because of their interaction with electronic excitations of the film. So, the limited facet size on cold-condensed metal films leads to additional IR activity: Raman lines of certain centrosymmetric adsorbate molecules (C2H4) are observed.
机译:厚度在纳米范围内的金属膜是光学透明的。借助红外透射光谱,可以在不存在电接触的情况下研究与膜生长过程相关的面内膜电导率,并且在金属岛膜上,由于表面增强的红外吸收(SEIRA),可以观察到吸附物振动。他们的分析可以深入了解吸附物与金属的结合,因此可以提供有关可用吸附位点和与之相关的结晶面的信息。如在IR反射吸收光谱中,不同位置上分子的偶极-偶极相互作用会根据无序程度(“原子粗糙度”)修改振动线。根据该粗糙度,由于吸附物振动的IR光谱与膜的电子激发相互作用,因此可以进一步修改。因此,冷缩金属膜上的刻面尺寸有限会导致额外的IR活性:观察到某些中心对称吸附物分子(C2H4)的拉曼线。

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