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American Institute of Physics, The Journal of Chemical Physics, 7(134), p. 074302

DOI: 10.1063/1.3537739

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UV–visible absorption of small gold clusters in neon: Aun (n = 1–5 and 7–9)

Journal article published in 2011 by S. Lecoultre, A. Rydlo, C. Félix ORCID, J. Buttet, S. Gilb, W. Harbich
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We present optical absorption spectra in the UV-visible range (1.5 eV < E < 6 eV) for mass selected neutral gold clusters Au(n) (n = 1-5 and 7-9) embedded in solid Ne at 7 K. The experimental spectra are compared with time-dependent density functional calculations. Electronic transitions are distributed over the whole energy range without any concentration of the oscillator strength in a small energy window, characteristic for the more s-like metals such as the alkalis or silver. Contrary to the case of silver and partly copper clusters, transitions issued from mainly d-type states are significantly involved in low energy transitions. The measured integrated cross section is smaller (<20%) than expected from a free-electron system, manifesting the strong screening of the s electrons due to the proximity of the s and d levels in gold.