Dresden 2011 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 7: Poster: Cluster

MO 7.7: Poster

Montag, 14. März 2011, 16:00–18:00, P1

Angular distribution of (CO₂)_n scattered off a Si(111)/SiO₂ surface — Wolfgang Christen, •Tim Krause, and Klaus Rademann — Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin

Interest in cluster-surface collisions has mostly focused on rare gas and metal clusters, and precious little is known about the surface interaction of van der Waals bound molecular clusters at moderate energies.
Employing a specialized setup¹ for the experimental investigation of chemical processes occurring between neutral van der Waals bound clusters and a solid surface in the hyperthermal energy range we report first results on the angular distribution of a pulsed supersonic beam of pure CO₂ scattered off a Si(111)/SiO₂ surface under ultrahigh vacuum conditions. Scattered particles are detected using time resolved mass spectrometry. A translator stage provides the possibility to sample either the incoming beam (target surface retracted) or to determine the angular and velocity distribution of scattered particles. Angular information is obtained by rotating the target surface, Θ_scatter=Θ_in+Θ_out.

¹W. Christen, K. Rademann, Rev. Sci. Instrum. 77, 015109, 2006.