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

Abstract : We present optical absorption spectra from the ultraviolet to the visible for size selected neutral Agn 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.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-02289847
Contributor : Marie-Gabrielle Chautard <>
Submitted on : Tuesday, September 17, 2019 - 10:58:06 AM
Last modification on : Thursday, October 15, 2020 - 8:54:04 AM

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C. Q. Yu, R. Schira, H. Brune, B. von Issendorff, Franck Rabilloud, et al.. Optical properties of size selected neutral Ag clusters: electronic shell structures and the surface plasmon resonance. Nanoscale, Royal Society of Chemistry, 2018, 10 (44), pp.20821-20827. ⟨10.1039/c8nr04861d⟩. ⟨hal-02289847⟩

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