title: Probing the geometries, relative stabilities, and electronic properties of neutral and anionic Ag(n)S(m) (n + m ≤ 7) clusters.
abstract: The geometry structures, relative stabilities, and electronic properties of neutral and anionic Ag(n)S(m) (n + m ≤ 7) clusters have been investigated systematically by means of density function theory (DFT). The results of geometry optimization show that the most stable configurations of binary Ag(n)S(m)⁰/⁻ clusters have an early appearance of 3D structure at n = 3, m = 1, differing from those of pure silver and sulfur clusters. Moreover, the ground-state structures prefer low spin multiplicity (singlet or doublet) except for S₂, Ag₂S₃, Ag₂S₄, Ag₄S₃, and Ag₂S₅. The calculated electron detachment energies (both vertical and adiabatic) are in good agreement with experimental data. This further lends considerable credence for the lowest-energy structures and the chosen computational method. By calculating the binding energies, fragmentation energies, second-order difference of energies and HOMO-LUMO energy gaps of neutral and anionic Ag n S m clusters, the relative stability and electronic property as a function of cluster size are discussed in detail. Further, in order to understand the nature of the bond in doped clusters and pure clusters, we have performed the contour maps of their HOMOs and analyzed their composition.
authors.affiliation: Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China.
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Han
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Kuang
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Ding
authors.forename: Peng
authors.initials: P
authors.lastname: Shao
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Jin
authors.forename: Hong-Hong
authors.initials: HH
authors.lastname: Li
mesh_terms: D003198:Computer Simulation; D004583:Electrons; D004735:Energy Transfer; D008956:Models, Chemical; D008958:Models, Molecular; D015394:Molecular Structure; D018030:Silver Compounds / Q000737:chemistry*; D013329:Structure-Activity Relationship
chemical_list: D018030:Silver Compounds; C013251:silver sulfide