Line broadening, shifting and mixing parameters of OCS perturbed by O2 in the ν3+ν2-ν2 and 5ν2-ν2 bands

Molecular spectroscopic parameters are useful for the interpretation of high-resolution infrared spectra of gaseous species in the Earth's atmosphere and those of giant planets. In this work line broadening, shifting and mixing parameters have been measured for the nu(3) + nu(2) - nu(2) and 5 nu(2) - nu(2) bands of the primary isotopologue of carbonyl sulfide ((OCS)-O-16-C-12-S-32), perturbed by O-2 at room temperature. Measurements have been made using a high-resolution Fourier transform spectrometer (Bruker IFS125HR, resolution = 0.004 cm(-1)) at the LISA Laboratory in France. A total of six pressures between 5.80 and 83.2 Torr of O-2 perturbing gas were recorded. The measurements cover the P and R branches of the studied bands, located in the 5 mu m spectral region. The line broadening, shifting and mixing parameters were derived using a multi-pressure fitting method, applied to the measured shapes of the lines, including line-mixing effects. The results are compared with values calculated using a semi-classical model based on the Robert and Bonamy formalism that reproduces rather well the observed m rotational dependence of the O-2 broadening coefficients. (C) 2013 Elsevier Inc. All rights reserved.