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MO: Fachverband Molekülphysik

MO 5: Posters 1: Novelties in Molecular Physics

MO 5.21: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Improving the Angular Accuracy in Molecular Beam-Surface Scattering Experiments — •Paul Saftien, Bo-Gaun Chen, and Wolfgang Christen — Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, http://clusterlab.de

In molecular beam-surface scattering experiments a precise alignment of the incoming beam, the target surface, and the particle detector is desirable.

We present a straightforward method allowing for an accurate positioning of the solid substrate in molecular beam-surface scattering experiments such that the beam-surface-detector angle is well defined. The method is demonstrated for measurements of the angular distribution of a pulsed supersonic helium beam, scattered off a chemically inert Si(111)/SiO₂ surface. Based on a geometric model, target and detector positions are systematically varied in order to obtain a most precise surface alignment.