Optical properties of size selected neutral Ag clusters: electronic shell structures and the surface plasmon resonance

We present optical absorption spectra from the ultraviolet to the visible for size selected neutral Ag n clusters ( n = 5-120) embedded in solid Ne. We compare the spectra to time-dependent density functional calculations (TDDFT) that address the influence of the Ne matrix. With increasing size, sev...

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Bibliographic Details
Published in:Nanoscale 2018-11, Vol.1 (44), p.2821-2827
Main Authors: Yu, Chongqi, Schira, Romain, Brune, Harald, von Issendorff, Bernd, Rabilloud, Franck, Harbich, Wolfgang
Format: Article
Language:English
Subjects:
Absorption spectra
Atomic and Molecular Clusters
Banded structure
Clusters
Optical properties
Physics
Spherical shells
Surface chemistry
Surface plasmon resonance
Time dependence
Ultraviolet spectra
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Summary:We present optical absorption spectra from the ultraviolet to the visible for size selected neutral Ag n clusters ( n = 5-120) embedded in solid Ne. We compare the spectra to time-dependent density functional calculations (TDDFT) that address the influence of the Ne matrix. With increasing size, several highly correlated electron excitations gradually develop into a single surface plasmon. Its energy is situated between 3.9 and 4.1 eV and varies with size according to the spherical electronic shell model. The plasmon energy is highest for clusters with atom numbers fully filling states with the lowest radial quantum number ( e.g. 1s, 1p, 1d,...). TDDFT calculations for clusters with several candidate geometrical structures embedded in Ne show excellent agreement with the experimental data, demonstrating that the absorption bands depend only weakly on the exact structure of the cluster. We present optical absorption spectra from the ultraviolet to the visible for size selected neutral Ag n clusters ( n = 5-120) embedded in solid Ne.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr04861d