Charge-induced dipole vs. relativistically enhanced covalent interactions in Ar-tagged Au-Ag tetramers and pentamers

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DOIResolve DOI: http://doi.org/10.1063/1.4923255
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TypeArticle
Journal titleJournal of Chemical Physics
ISSN0021-9606
Volume143
Issue2
Article number24310
SubjectDensity functional theory; Genetic algorithms; Isomers; Charge-induced dipoles; Covalent character; Covalent interactions; Energy isomers; Experimental spectra; Multiple-photon dissociation; Binding energy
AbstractVibrational spectra of Au n Ag m + · Ar k (n + m = 4, 5; k = 1-4) clusters are determined by far-infrared resonant multiple photon dissociation spectroscopy in the range ν = 100 -250 cm-1. The experimental spectra are assigned using density functional theory for geometries obtained by the Birmingham cluster genetic algorithm. Putative global minimum candidates of the Ar complexes are generated by adding Ar atoms to the Au n Ag m + low energy isomers and subsequent local optimization. Differential Ar binding energies indicate exceptionally strong Au-Ar bonds in Au-rich clusters, leading to fundamental changes to the IR spectra. The stronger Ar binding is attributed to a relativistically enhanced covalent character of the Au-Ar bond, while in Au-rich species charge-induced dipole interactions overcompensate the relativistic affinity to Au. Moreover, not only the absolute composition but also the topologies are essential in the description of Ar binding to a certain cluster.
Publication date
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21276925
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Record identifier08117ec8-89db-4a19-8633-8791b4508284
Record created2015-11-10
Record modified2016-05-09
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