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MO: Fachverband Molekülphysik

MO 26: Spektroskopie in He-Tröpfchen

MO 26.3: Poster

Donnerstag, 13. März 2008, 16:30–19:00, Poster C1

Solvation of HCl - aggregation of H₂O, HCl and their deuterated isotopes in superfluid He droplets — Markus Ortlieb, Özgür Birer, Gerhard Schwaab, •Anna Gutberlet, and Martina Havenith — Department of Physical Chemistry II, Ruhr-University Bochum, Universitätsstr. 150, D-44780

We investigate aggregates of HCl, H₂O and their deuterated isotopes embedded in superfluid helium using a helium nanodroplet spectrometer combined with an infrared OPO set up with an output power of up to 2.7 W and a resolution of better than 0.001 cm⁻¹. Depletion spectra of the super cooled aggregates (0.37 K) were recorded between 2650 cm⁻¹ and 2720 cm⁻¹. We were able to assign the HCl stretch vibration of the HCl-H₂O complex. We also observed spectral features of (HCl)_m(H₂O)_n aggregates and isotopes in the region of the H₃O⁺ stretch vibration. We have investigated the question of how many H₂O molecules are needed to solvate HCl. Therefore we detected the pressure dependent intensity of the signal and did mass selective spectroscopy.