Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.10: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV

Supersonic beams of neutral and ionic CO₂ clusters — •Bo-Gaun Chen, Mona Kositzki, Klaus Rademann, and Wolfgang Christen — Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin

The formation and growth of clusters in the gas phase is of fundamental relevance. Recent progress in experimental techniques¹⁻³ and the advanced thermodynamic analysis of velocity distributions of supersonic jets^4,5 permit an improved comprehension of these condensation processes.

We present a comprehensive investigation of CO₂ cluster beams from sub- to supercritical source densities, covering cluster sizes from 3×10² to 3×10⁵ molecules per particle. In particular we report on the change (both increase and decrease) of the flow velocity with source density, the effect of source temperature on translational cooling, and compare the results for neutral and charged clusters.

¹W. Christen, T. Krause, K. Rademann, Rev. Sci. Instrum. 78, 073106, 2007.
²W. Christen, T. Krause, B. Kobin, K. Rademann, J. Phys. Chem. A 115, 6997, 2011.
³K. Luria, W. Christen, U. Even, J. Phys. Chem. A 115, 7362, 2011.
⁴W. Christen, K. Rademann, Phys. Scr. 80, 048127, 2009.
⁵W. Christen, K. Rademann, U. Even, J. Phys. Chem. A 114, 11189, 2010.