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Proceedings Paper

Vibrational spectra of isomeric hydrogen-bonded complexes of (HF)2H2O
Author(s): E. G. Tarakanova; Friedrich Huisken; M. Kaloudis
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Paper Abstract

Infrared molecular beam depletion spectroscopy has been used to study the absorption of (HF)n polymers (n equals 2 - 8) embedded in large liquid helium host clusters consisting of a few thousand helium atoms. In the vicinity of 3597 cm-1 a new absorption band was observed for the first time. The corresponding spectrum is shown in figure 1a. Comparison with the spectra obtained earlier for free gas phase HF clusters reveals that the new feature cannot be assigned to a pure HF cluster. Taking into account that the depletion spectrum was recorded with the mass spectrometer tuned to mass m equals 41 amu, one could assume that it was caused by a hydrogen-bonded heterocomplex containing at least two HF molecules. Since water molecules are easily picked up from the residual gas by the helium clusters it could very well be that the absorption in question is caused by one of the stretching vibrations of the (HF)2H2O heterotrimer. To verify this assumption, a theoretical modeling of the vibrational spectra of the (HF)2H2O complex was performed for both the free gas phase and the case when it is embedded in a cryogenic Ar matrix. For the latter case accurate experimental data are available. The purpose of the present study was to obtain information on the structure of the heterotrimer and to identify the stretching vibration responsible for the absorption at 3597 cm-1.

Paper Details

Date Published: 3 March 1997
PDF: 3 pages
Proc. SPIE 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy, (3 March 1997); doi: 10.1117/12.267761
Show Author Affiliations
E. G. Tarakanova, Institute of General and Inorganic Chemistry (Russia)
Friedrich Huisken, Max-Planck-Institut fuer Stroemungsforschung (Germany)
M. Kaloudis, Max-Planck-Institut fuer Stroemungsforschung (Germany)

Published in SPIE Proceedings Vol. 3090:
12th Symposium and School on High-Resolution Molecular Spectroscopy
Leonid N. Sinitsa; Yurii N. Ponomarev; Valery I. Perevalov, Editor(s)

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