Optical absorption spectra of intermediate-size silver clusters from first principles

Kopinjol Baishya, Juan C. Idrobo, Serdar Öǧüt, Mingli Yang, Koblar Jackson, Julius Jellinek

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Abstract

Optical absorption spectra of the three lowest-energy isomers of Agn (n=10,12-20) are investigated from first principles within the time-dependent local-density approximation (TDLDA). The computed spectra are found to be generally in good agreement with the available experimental data. The analyses of the spectra indicate that the d electrons of Agn clusters in this size range have a significant (70%-80%) contribution to low-energy optical excitations. We show that most of the peak positions and the relative intensities in the TDLDA spectra of these subnanometer sized clusters can be explained remarkably well within the classical Mie-Gans theory, using the dielectric function of bulk Ag and taking into account the shapes of the isomers.

Original languageEnglish
Article number075439
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number7
DOIs
StatePublished - Aug 27 2008

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