"Raman enhancement by plasmonic excitation of structurally-characterized metal clusters: Au_8, Ag_8, and Cu_8", Phys. Chem.
"Raman enhancement by plasmonic excitation of structurally-characterized metal clusters: Au_8, Ag_8, and Cu_8", Phys. Chem.
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“通过等离激元激发结构特征金属簇的拉曼增强：Au_8、Ag_8 和 Cu_8”，Phys。
DOI：
10.1039/c3cp44537b
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. Yasuike and K. Nobusada
中科院分区：
文献类型：
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作者：
玉光弘典;齋藤健一;原渕祐;T. Yasuike and K. Nobusada
利用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.与钠簇不同[Yasuike等人，Phys. Rev. A，2011，83，013201]，本发明金属簇中的等离子体激元激发被背景d-电子激发强烈减少，即，朗道阻尼。为了避免等离子体激元强度的降低，控制团簇结构是一种很有前途的策略。我们证明线性团簇的等离子激元激发与背景d电子激发部分解耦，并且它们的强度比三维双帽八面体异构体的强度强得多。线性异构体对吡嗪分子的拉曼振动光谱有很强的增强作用。
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 et al., 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.