| Autor: |
Letzner, Melanie, Gruen, Sarah, Habig, Daniel, Hanke, Kenny, Endres, Torsten, Nieto, Pablo, Schwaab, Gerhard, Walewski, Łukasz, Wollenhaupt, Miriam, Forbert, Harald, Marx, Dominik, Havenith, Martina |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; Oct2013, Vol. 139 Issue 15, p154304, 11p, 2 Diagrams, 3 Charts, 8 Graphs |
| Abstrakt: |
We report a detailed study on the IR spectroscopy of HCl-water complexes in superfluid helium nanodroplets in the frequency range from 2660 to 2675 cm-1. We have recorded spectra of HCl-H216O as well as of HCl-H218O complexes and compared these results with theoretical predictions. In addition, we have carried out mass-selective intensity measurements as a function of partial pressure of HCl as well as of H218O (pick-up curves). The results support a scenario where the IR-absorption in this part of the spectrum contains contributions from undissociated as well as from dissociated clusters with Cl-(H2O)3(H3O)+ being the smallest dissociated complex. These findings are corroborated by additional electric field measurements yielding the orientation of the vibrational transition moment with respect to the permanent dipole moment. As a result we are able to assign a broad absorption band starting at 2675 cm-1 to dissociated HCl-water clusters (HCl)1(H2O)n with n >= 4. The two narrow absorption lines at 2667.9 cm-1 and 2670 cm-1 are assigned to an undissociated cluster, in agreement with previous studies. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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