Dresden 2011 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 8: Poster: Spectroscopy in He Droplets

MO 8.2: Poster

Montag, 14. März 2011, 16:00–18:00, P1

Doping of helium nanodroplets with an ionic liquid — •Kenny Hanke, Torsten Poerschke, Gerhard Schwaab, and Martina Havenith — Department of Physical Chemistry 2, Ruhr-Uni-Bochum, Germany

Helium nanodroplets provide an ultracold but very soft matrix for the IR-spectroscopy of single molecules and small clusters. Therefore we have constructed a modular helium cluster machine with differentially pumped chambers. In the first chamber precooled gaseous helium is expended through a 5 µm nozzle into vacuum. The formed helium cluster beam can be adjusted to different average cluster sizes via the nozzle temperature (11-20 K) and helium pressure (20-70 bar). Two inlets for gaseous or liquid reactants are provided in the second chamber. The partial pressure of the components can be controlled by electrical regulating valves and a residual gas analyzer attached to the chamber. Liquids with a high vapor pressure and solids can be evaporated with an oven in the third chamber. The flow and composition of the helium beam is detected with a quadrupol mass spectrometer in the last chamber. A laser can be coupled in for infrared spectroscopy.

To prove the efficiency of the machine an ionic liquid, which are known for their low vapor pressure, has already successfully been evaporated and embedded in the helium cluster beam.