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Using Fourier transform spectrometer, He-broadening coefficients in theandbands of carbonyl sulfide ( 16 O 12 C 32 S) have been measured for the first time in the  P-  and  R -branches. Measurements have been performed at room temperature (295 K) for 200 ro-vibrational lines with rotational quantum number ranging from 1 ≤  J  ≤ 64, using a mono-spectrum non-linear least squares fitting of Voigt profiles. The measured values were discussed as a function of the rotational quantum number and compared to previous data. These broadening coefficients were also calculated on the basis of Robert and Bonamy's formalism using an  ab-initio  potential energy surface (PES). In addition, we have measured pressure shift coefficients for 92 transitions in both bands, these results were compared with those of the 2ν 3  band. The line intensities in theandbands were also retrieved using the same spectra. The analysis of these intensities allows us to derive a consistent set of line intensity parameters such as vibrational transition moments, band intensities as well as Herman-Wallis (HW) coefficients.

molecular physics

Line intensity parameters, He-broadening and line shift coefficients in the 2 v                  2                  0  and 3 v                  2                  1  −  v                  2                  1  bands of OCS