Affiliations: [a] Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, E-47001 Valladolid, Spain | [b] Institut für Theoretische Physik, Freie Universität Berlin, D-14195 Berlin, Germany | [x] Department of Chemistry, University of Patras, Greece | [y] Departamento de Quimica, CINVESTAV, Centro De Investigacion Y De Estudios Avanzados, Av. Instituto Politecnico Nacional, 2508, A.P. 14-740, Mexico, D.F. 07000, Mexico
Abstract: The reactivity between lithium and the Al13 cluster is studied using the density functional theory and the local density approximation (LDA) for exchange and correlation. The effects caused by the addition of two Li atoms on the structural and electronic properties of the Al cluster are analyzed by calculating equilibrium geometries, binding energies and ionization potentials. The corresponding positively and negatively charged species are also studied. The influence of the alkali atoms on the geometrical structure of the cluster is small, but the influence on the electronic structure is much larger. The cluster Al13Li, with 40 valence electrons, has closed electronic shells and Al13Li2 has a single electron in the next shell. A striking result is the large drop of the ionization potential of the cluster induced by the addition of the second Li atom. These properties have been related to the changes of the electronic density by the analysis of density difference maps and atomic Hirshfeld charges. The photoabsorption spectrum has been calculated using the time-dependent version of the density functional theory.
Keywords: Bimetallic clusters, aluminium, lithium, photoabsorption spectrum, density functional theory
