On the Electronic and Atomic Structures of Small AuN- (N = 4−14) Clusters: A Photoelectron Spectroscopy and Density-Functional Study
Citations Over TimeTop 1% of 2003 papers
Abstract
We report a joint experimental and theoretical study of the electronic and atomic structures of small gold clusters with up to 14 atoms. Well-resolved photoelectron spectra were obtained for AuN- (N = 1−14) at several photon energies. Even−odd alternations were observed, where the even-sized clusters (except Au10-) exhibit an energy gap between the lowest binding energy peak and the rest of the spectrum, indicating that all the neutral even-sized clusters have closed shells. The Au10- spectrum reveals the existence of isomers, with the ground-state cluster exhibiting an extremely high electron binding energy. Evidence of multiple isomers was also observed in the spectra of N = 4, 8, 12, and 13. The structures of the gold cluster anions in the range N = 4−14 were investigated using first-principles simulations. A striking feature of the anionic clusters in this range is the occurrence of planar ground-state structures, which were predicted in earlier theoretical studies (Häkkinen, H.; et al. Phys. Rev. Lett. 2002, 89, 033401) and observed in ion-mobility experiments (Furche, F.; et al. J. Chem. Phys. 2002, 117, 6982) and the existence of close-lying isomers. The calculated electron detachment energies and density of states were compared with the measured data, which confirmed the ground-state structures of the anions. It is found that the main isomers observed experimentally indeed consist of planar clusters up to Au12-, whereas for Au13- and Au14- the theoretical results from three-dimensional isomers agree better with the experiment, providing further support for the 2D to 3D structural transition at Au12-, as concluded from previous ion mobility experiments. We also find that small neutral clusters exhibit a tendency to form two-dimensional structures up to a size of 13 atoms.
Related Papers
- → The Influence of Functionals on Density Functional Theory Calculations of the Properties of Reducible Transition Metal Oxide Catalysts(2013)54 cited
- → Physical Properties Of Uranium Dinitride Un2 By Using Density Functional Theory (Dft And Dft+U)(2015)3 cited
- → Structural and Spectroscopic Characterization of Mer-[RhBr3(Me2pzH)3] (Me2pzH = 3, 5-Dimethylpyrazole); Interpreting the Results with Density Functional Theory Calculations(2010)6 cited
- Study of Electronic and Molecular Properties of Poly (3-Octylthiophene-2,5 diyl) Polymer using Density Functional Theory (DFT) And Time-Dependant Density Functional Theory (TD-DFT)(2021)
- Core Level Binding Energy Shifts Caused by Size Effect of Nanoparticles(2008)