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MO: Fachverband Molekülphysik
MO 8: Poster: Spectroscopy in He Droplets
MO 8.1: Poster
Montag, 14. März 2011, 16:00–18:00, P1
IR-Spectroscopy of HCl with water in liquid Helium nanodroplets — •Melanie Letzner, Daniel Habig, Torsten Poerschke, Sarah Grün, Pablo Nieto, Kenny Hanke, Gerhard Schwaab, and Martina Havenith — Department of Physical Chemistry II, Ruhr Universität Bochum, Germany
We investigated aggregates of HCl and H2O at ultracold temperatures in helium nanodroplets which provide a gentle, ultracold matrix for studies of aggregation and solvation processes. Helium nanodroplets are formed by expansion of helium at 55 bar through a 5 µm nozzle which is kept at a temperature of 18 K. Under these conditions clusters with an average size of 8000 atoms are formed. Measurements were carried out using a high power IR-OPO (cw: 1.8 W) as radiation source. Depletion spectra of the super cooled aggregates (0.37 K) were recorded between 2650 cm−1 and 3300 cm−1. We observed spectral features of (HCl)m(H2O)n aggregates in the region of the H3O+ stretch vibration. The observed pressure dependence of the signals in combination with optically selective mass spectroscopy (OSMS) and pick up curves allowed assignment of the signals. We observed IR spectra of the dissociated HCl-water cluster.