Evolution of the nu(HF) vibrational-rotational absorption bands in the OC ... HF and CO ... HF complexes with increasing density

Evolution of the VHF vibrational-rotational band in an HF/CO mixture is stu died at CO density successively increasing from a dilute gas to condensed s ystem. By using super-Lorentzian contours, the vibrational-rotational band of free HF molecules was calculated for the density ranging From 15 to 310 Amagat, and, by separating the bands, the shape of the band of bound molecu les, which comprises the VHF bands in the OC...HF and CO...HF complexes, wa s determined. The relative intensity of these bands was found to be 2.3. By using a nonempirical potential within the context of an approximate separa tion of the radial and angular motions, the energies of vibrational-rotatio nal states were computed, as well as the frequencies of transitions between them, which were used for calculating the vibrational-rotational absorptio n band of the isolated OC...HF complex. With the spectral exchange effects taken into account in terms of the model of strong collisions, the variatio n of the band shape of the OC...HF complex on increasing the system density was calculated. Parameters of the band of the weaker CO...HF complex were measured, and its enthalpy Delta H-2 = -770 cm(-1) was found from estimatio n of its energy.