Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 8: Poster: Spectroscopy in He Droplets
MO 8.3: Poster
Montag, 14. März 2011, 16:00–18:00, P1
High Resolution IR-Spectroscopy of HCl-H2O-Clusters in Helium-Nanodroplets — •Sarah Angelique Grün, Gerhard Schwaab, and Martina Havenith — Ruhr-Universität-Bochum, Bochum, Deutschland
We have studied the microsolvation of HCl in helium nanodroplets via high−resolution infrared (IR) spectroscopy using the Bochum He−nanodroplet apparatus in combination with a home−built cw−Optical Parametric Oscillator (OPO) with full frequency coverage in the range from 2600−3200 cm−1, high output power (up to 2.7 W), and high resolution (0.0001 cm−1).
After formation the helium nanodroplets were doped successively with HCl and H2O in a differentially pumped pickup chamber. The average number of embedded molecules depends on the partial pressures in the pickup chamber which were in a range up to 2.0 mPa. In order to assign spectroscopic signals to a special species we have carried out mass selective measurements to record the change in the intensity of the depletion signal in dependence of the partial pressure of water for a given HCl pressure (pickup curves). The masses we were focused on belong to different hydronium-water-clusters.