Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 3: Atomic Clusters I

A 3.1: Hauptvortrag

Montag, 19. März 2007, 10:30–11:00, 5M

Inelastic interaction of free electrons with pristine and doped rare gas clusters — •Paul Scheier, Stephan Denifl, Fabio Zappa, Philipp Sulzer, Ingo Mähr, Andreas Mauracher, and Tilmann Märk — Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens Universität, Innsbruck, Austria

Pickup of gas phase molecules including fullerenes and biomolecules into superfluid He droplets is a tool to form complex targets at ultra-low temperatures (0.37 K). Free electron attachment to monomers and clusters of these molecules embedded in superfluid He droplets has been studied for the first time and exhibits several interesting features. We observe, on the one hand, stabilization of transient negative parent ions via solvation which are otherwise unstable isolated in the gas phase. On the other hand, we see an increase of the cross section of various anions at electron energies above electronic excitation of the rare gas and the embedded molecules. Extremely efficient cooling by the cold rare gas droplet can stabilize otherwise unstable intermediate reaction products and thus offers unique possibilities to identify complex molecular processes step by step. In addition to He droplets we also started experiments with pristine and doped neon clusters.