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Issue 15, 2013
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Raman enhancement by plasmonic excitation of structurally-characterized metal clusters: Au8, Ag8, and Cu8

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Abstract

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.

Graphical abstract: Raman enhancement by plasmonic excitation of structurally-characterized metal clusters: Au8, Ag8, and Cu8

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Article information


Submitted
15 Dec 2012
Accepted
06 Feb 2013
First published
07 Feb 2013

Phys. Chem. Chem. Phys., 2013,15, 5424-5429
Article type
Paper

Raman enhancement by plasmonic excitation of structurally-characterized metal clusters: Au8, Ag8, and Cu8

T. Yasuike and K. Nobusada, Phys. Chem. Chem. Phys., 2013, 15, 5424
DOI: 10.1039/C3CP44537B

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