Düsseldorf 2007 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Ionenfallen und Cluster
MS 5.3: Vortrag
Mittwoch, 21. März 2007, 12:00–12:15, 5F
Collision-induced fragmentation of free sulfur clusters — •Tiberiu Arion1, Roman Flesch1, Thomas Schlathölter2, Fresia Alvarado2, Ronnie Hoekstra2, Reinhard Morgenstern2, and Eckart Rühl1 — 1Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany — 2Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands
Fragmentation of multiply charged sulfur clusters is investigated by multicoincidence spectroscopy. The experiments are carried out at the electron cyclotron resonance source at the KVI Groningen, where beams of Xeq+ (q = 5, 10, 15, 20) are produced. The Xeq+ - ions are accelerated to kinetic energies of 8-10 x q keV and collided with the free sulfur clusters. Variable size sulfur clusters are prepared in a two stage oven source, where the temperature of the oven is used to adjust the cluster size. Most experiments were performed using molecular sulfur (S8). Ion-ion-coincidence as well as mass spectra were recorded. S+ / Sn+ (n = 1 − 6) coincidences are observed as a result of collisions with highly charged projectiles. Moreover, coincidences between singly charged atoms or clusters, such as S+/S2+, or S2+/S3+ are found preferentially in collisions with ions of lower charge, such as XeZ+ (Z > 5). Possible mechanisms of cluster fragmentation are discussed. The results are compared to earlier experiments on core excited sulfur clusters.