The vibrational spectrum of the OCS molecule based on the data on spectra of liquid and cryosolutions

The IR absorption spectra of liquid OCS ( T = 135(1) K) and of the following solutions—OCS + Ar ( T = 90 K), OCS + N 2 ( T = 90 K), OCS + Kr ( T = 130 K), and OCS + Xe ( T = 163 K)—are measured in the range 800–7000 cm −1 . From 16 to 40 bands corresponding to transitions to vibrational states up to the third order inclusive are interpreted for basic isotope modification and for the isotopically substituted molecules 18 O 12 C 32 S, 16 O 13 C 32 S, and 16 O 12 C 34 S. In the spectra of the liquids, the spectral moments M (1) and M (2) of all the observed bands are determined. The harmonic frequencies ω i and the anharmonicity constants x ik are calculated for all the systems, including the liquid. The anharmonicity is found to be constant within the experimental error. A large shift Δω 3 is primarily determined by the dipole-induced dipole interaction.