Vibrational spectra of isomeric hydrogen-bonded complexes of (HF)2H2O

E. G. Tarakanova; Friedrich Huisken; M. Kaloudis

doi:10.1117/12.267761

3 March 1997 Vibrational spectra of isomeric hydrogen-bonded complexes of (HF)₂H₂O

E. G. Tarakanova, Friedrich Huisken, M. Kaloudis

Proceedings Volume 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy; (1997) https://doi.org/10.1117/12.267761
Event: 12th Symposium and School on High Resolution Molecular Spectroscopy, 1996, St. Petersburg, Russian Federation

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.

Citation Download Citation

E. G. Tarakanova, Friedrich Huisken, and M. Kaloudis "Vibrational spectra of isomeric hydrogen-bonded complexes of (HF)₂H₂O", Proc. SPIE 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy, (3 March 1997); https://doi.org/10.1117/12.267761

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