Berlin 2005 – wissenschaftliches Programm

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MS: Massenspektrometrie

MS 3: Cluster und Aerosole

MS 3.1: Hauptvortrag

Freitag, 4. März 2005, 14:00–14:30, HU 3088

Laser fragmentation and mass spectrometry of binary clusters — •Peter Lievens, Sven Neukermans, Ewald Janssens, Xin Wang, Nele Veldeman, and Roger E. Silverans — Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U.Leuven, B-3001 Leuven, Belgium

We report on recent studies of metal atom doped clusters of noble metals (Ag and Au) and group IVa elements (Si, Ge, Sn, Pb). Beams of binary clusters are produced with a dual-target dual-laser vaporization source. Size and composition dependent stability fluctuations are investigated with photofragmentation and mass spectrometry. Evidence is presented for the existence of combined highly symmetric closures of shells of atoms and shells of electrons for specific binary cluster species. Phenomenological interpretations of new electronic shell closures are given and compared with density functional theory calculations of their geometrical and electronic structure.

This work was supported by the Fund for Scientific Research - Flanders (FWO), the Flemish Concerted Action (GOA) program, and the Belgian Interuniveristy Poles of Attraction (IAP) program.