Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets

MO 19.15: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Characterization of pulsed nozzles for production of atomic and molecular clusters — •Matthias Bohlen, Jonas Grzesiak, Aaron LaForge, Rupert Michiels, Nicolas Rendler, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg

Pulsed nozzles in general offer many advantages over continuous beams such as higher droplet densities and reduced gas load. We use a home-built pulsed nozzle, developed in cooperation with CRUCS Center at UBC, Vancouver, that produces gas pulses down to 20 µ s duration at repetition rates up to several hundred Hz. Investigations of power consumption and other properties are presented. A rich variety of applications, that include the production of water and ammonia clusters, is discussed as well as the characterization of the influence of multiple source parameters on the cluster size distribution.

Additionally, we have recently introduced a new method for doping clusters by laser ablation [1]. Here, we present the results from characterization of the laser ablation setup. In particular, it was shown that pulsed nozzles produce beams of both doped and seeded laser ablated material.

[1] R. Katzy, M. Singer, S. Izadnia, A.C. LaForge, F. Stienkemeier; Rev. Sci. Instrum., in press