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The shape of the vibration-rotation v(HF) band is studied in HF/Xe and HF/CO mixtures at increasing Xe (or CO) density from gaseous to liquid phase at 293 K. The evolution of the v(HF) band is determined by coexistence of ensembles of free and complexed molecules. The band of free HF molecules is calculated using the super-Lorentzian profile for rotational HF lines. The vHF bands of the Xe. . . HF, OC. . .HF and CO. . . HF complexes, which appear in the absorption region of P(1) and P(1)-P(4) rotational lines of HF, are formed by superposition of the vibration-rotation bands due to hot transitions from excited levels of the low-frequency intermolecular modes. The v(subscript HF bands in the complexes experience a low-frequency shift and become more symmetric with increasing density. A model taking into account spectral exchange between overlapping lines provides correct description of the complex band shape evolution with increasing density.
K. G. Tokhadze,S. S. Utkina,N. N. Filippov, andZ. Mielke
"vHF band shape in Xe...HF, OC...HF complexes in transition from dilute gas to condensed systems", Proc. SPIE 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy, (3 March 1997); https://doi.org/10.1117/12.267777
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K. G. Tokhadze, S. S. Utkina, N. N. Filippov, Z. Mielke, "vHF band shape in Xe...HF, OC...HF complexes in transition from dilute gas to condensed systems," Proc. SPIE 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy, (3 March 1997); https://doi.org/10.1117/12.267777