Abstract
The metal clusters [Pb(m)Ag](-) (m = 1-4) are studied by photoelectron (PE) spectra and density functional theory (DFT). The adiabatic electron affinity (EA) and vertical detachment energy (VDE) of [Pb(m)Ag](-) are obtained from PE spectra at 308 nm. Theoretical calculation is carried out to search for the lowest-energy geometry and elucidate their structures and bonding mode. By comparing the theoretical results, including EA, VDE and simulated density of state (DOS) spectra, with the experimental determination, the lowest-energy structures for each species are obtained. The analysis of the molecular orbital composition provides evidence that the silver atom binds on lead clusters through an Ag-Pb sigma bond. Moreover, the clusters of [Pb(3)](2-), [Pb(4)](2+), Pb(4) and [Pb(4)](2-) are investigated for aromaticity.
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