Charge and Compositional Effects on the 2D–3D Transition in Octameric AgAu Clusters

Christopher Heard, Armin Shayeghi, Rolf Schaefer, Roy Johnston

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
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Abstract

The unbiased density functional-based Birmingham Cluster Genetic Algorithm is employed to locate the global minima of all neutral and mono-ionic silver-gold octamer clusters. Structural, energetic and electronic trends are determined across the series, in order to clarify the role of composition and charge on the position of the 2D–3D transition in ultrasmall coinage metal systems. Our calculations indicate a preference for three dimensional structures at high silver concentrations, which varies significantly with charge. The minimum in composition dependent mixing energies is independent of the charge, however, with a preference for the maximally mixed clusters, Ag4Au4 ν for all charge states ν. The sensitivity of isomeric preference to ν is found to be greater for electron-rich and electron-deficient clusters, implying a complexity of unambiguous determination of cluster motifs in related experiments. Vertical ionization potentials and detachment energies are calculated to probe electronic behaviour, providing numerical predictions for future spectroscopic studies.
Original languageEnglish
Pages (from-to)955–975
Number of pages21
JournalZeitschrift fur Physikalische Chemie
Volume230
Issue number5-7
Early online date8 Feb 2016
DOIs
Publication statusPublished - May 2016

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