Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 9: Posters 1: Dichroism, VUV and Xray, Clusters, and Cold Molecules

MO 9.11: Poster

Tuesday, March 7, 2017, 17:00–19:00, P OG1

From Rare Gas to Hydrogen-bonded clusters: Size distributions of supersonic beams from a pulsed valve using the titration technique — •Matthias Bohlen, Aaron LaForge, Rupert Michiels, Nicolas Rendler, Mykola Shcherbinin, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Hermann-Herder-Str.3, D-79104 Freiburg i.B.

Pulsed valves, in general, offer many advantages over continuous beam sources such as higher beam densities and reduced gas load. Recently, we developed a pulsed valve in collaboration with UBC, Vancouver, which produces supersonic gas pulses down to 20 µs duration at repetition rates up to several hundred Hz. Overall, the valve is versatile in the type of clusters which can be produced ranging from rare gas clusters to hydrogen bonded clusters. Additionally, cryogenic cooling of the valve can be utilized to produce helium nanodroplets. To estimate the cluster size distribution, we use the so-called titration technique [1], which has accurately determined cluster sizes of continuous supersonic beams. Here, we report on a systematic study of cluster size distributions by varying expansion parameters. We apply this technique to argon, ammonia, and water clusters.

[1] L. F. Gomez, E. Loginov, R. Sliter, A. F. Vilesov; J. Chem. Phys. 135, 154201 (2011)