Regensburg 2002 – wissenschaftliches Programm

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SYCO: Cluster auf Oberflächen

SYCO 2: Aggregation and Reactions

SYCO 2.7: Vortrag

Donnerstag, 14. März 2002, 17:15–17:30, H 36

Surface induced reactions for molecular ions and cluster ions of acetonitrile and ethanol — •Christian Mair1, Zdenek Herman2, Juraj Fedor3, Matthias Lezius1, and Tilmann Märk1,31Institut für Ionenphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck — 2V. Cermak Laboratory, J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, CZ-182 23 Prague 8, Czech Republic — 3Department of Plasma Physics, Comenius University, Mlynska dolina, 842 15 Bratislava, Slovak Republic

Collisions of acetonitrile monomer ions upon interaction with a hydrocarbon-covered stainless steel surface show both surface-induced dissociations of the projectile ion and chemical reactions of surface H-atom transfer leading to the protonated acetonitrile ion (followed by partial dissociation). Collisions of acetonitrile cluster cations resulted in formation of protonated acetonitrile monomer cations via an intracluster ion-molecule reaction on the one hand and a surface chemical reaction on the other hand. The second system deals with the surface collisions of ethanol monomer cations and protonated ethanol monomer, dimer and trimer cations. The amount of translational energy transferred into internal degrees of freedom upon the collision process could be determined. Product ion mass spectra obtained after surface collisions of protonated ethanol monomer and cluster cations gave evidence of the unimolecular decomposition of surface excited cluster ions via the sequential loss of monomeric units. Supp. by FWF, Assoc. EURATOM-ÖAW, BMWV, Wien, Austria, EURATOM-IPP.CR and GACR No. 203/00/0632.

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