Berlin 2001 – wissenschaftliches Programm

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MO: Molekülphysik

MO 1: Posters Monday: Clusters, Fullerenes and Nanotubes

MO 1.8: Poster

Montag, 2. April 2001, 12:30–15:00, AT3

Reactions of molecular ions and cluster ions with surfaces — •Christian Mair¹, Juraj Fedor², Matthias Lezius¹, Zdenek Herman³, and Tilmann Märk^1,2 — ¹Institut für Ionenphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck — ²Department of Plasma Physics, Comenius University, Mlynska dolina, SK-842 15 Bratislava, Slovak Republic — ³V. Cermak Laboratory, J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, CZ-182 23 Prague 8, Czech Republic

Experiments on surface interactions of molecular and cluster ions have been carried out on a tandem mass spectrometer consisting of a double focusing mass spectrometer in combination with a surface collision chamber and a time-of-flight mass spectrometer for secondary ion analysis. Results have been obtained for collisions of acetonitrile molecular cations CH3CN+, protonated acetonitrile cations CH3CNH+ and acetonitrile clusters (CH3CN)n+, n = 1-3, and with molecular (C2H5OH+) and protonated ((C2H5OH)H+) ethanol cations, as well as protonated ethanol clusters, (C2H5OH)nH+, n = 2,3 with a hydrocarbon covered stainless steel surface in the energy range of 5 to 70 eV. Besides hydrogen pick-up reactions from surface adsorbates, surface-induced molecular dissociations and surface-induced catalytic isomerization reactions, we have also detected and studied intracluster reactions and unimolecular cluster dissociation reactions introduced by surface impact. The different processes could be distinguished and studied in detail by using also deuterated molecules for cluster production. Project partially supported by ÖAW and BMWF, Wien, Austria.