			15min:

SOLVATION OF HCl, AGGREGATION OF H₂O, HCl AND THEIR DEUTERATED ISOTOPES IN SUPERFLUID He DROPLETS.

GERHARD W. SCHWAAB, OZGÜR BIRER, ANNA GUTBERLET, MARKUS ORTLIEB, 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 a cw 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. The question of how many H₂O molecules are needed to solvate HCl will be addressed.