Optical properties of silver and copper clusters with up to 150 atoms.

Highlights: [•] Lowest-energy structures (LES) of silver and copper clusters with N from 2 up to 150 atoms. [•] Calculation of the optical absorption spectra of the LES of Ag and Cu clusters using the classical Mie–Gans theory. [•] The spectra of the Ag clusters possess clearly identifiable shape-dependent plasmon peaks. [•] The absorption spectra for the Cu clusters are size/shape independent and do not show any plasmon peak. [•] Artificial Cu clusters: extremely oblate or prolate, show intensive and strongly shape-dependent maxima in good agreement with TDDFT calculations. [•] Good agreement with experiment and more complex TDDFT computations for silver clusters. [Copyright &y& Elsevier]