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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Raman enhancement by plasmonic excitation of structurally-characterized metal clusters: Au8, Ag8, and Cu8
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Raman enhancement by plasmonic excitation of structurally-characterized metal clusters: Au8, Ag8, and Cu8

机译：通过等离子激发结构表征的金属团簇Au8，Ag8和Cu8拉曼增强

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摘要

The optical responses of metal clusters, M8 (M = Au, Ag and Cu), are investigated by the linear response theory based on the density functional theory. Unlike sodium clusters [Yasuike ef a/., Phys. Rev. A, 2011, 83, 013201], the plasmonic excitations in the present metal clusters are strongly reduced by the background d-electron excitations, i.e., Landau damping. To avoid the reduction of plasmon intensity, the control of cluster structures is one of the promising strategies. We demonstrate that the plasmonic excitations of the linear clusters are partially decoupled with the background d-electron excitations and their intensities are much stronger than those of the three-dimensional bicapped octahedral isomers. The linear isomer gives a strong enhancement of the Raman vibrational spectrum of a pyrazine molecule.
机译：通过基于密度泛函理论的线性响应理论研究了金属团簇M8（M = Au，Ag和Cu）的光学响应。与钠团簇不同[Yasuike ef a /。，Phys。 Rev. A，2011，83，013201]，通过背景d电子激发，即Landau阻尼，强烈降低了本金属簇中的等离子体激发。为了避免等离子体激元强度的降低，控制簇结构是有前途的策略之一。我们证明线性团簇的等离激元激发与背景d电子激发是部分解耦的，并且其强度比三维二等八面体八面体的强度要强得多。线性异构体大大增强了吡嗪分子的拉曼振动光谱。

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