High resolution FTIR spectroscopy of sulfur dioxide in the 1550-1950 cm-1 region: First analysis of the ν1 + ν2/ν2 + ν3 bands of 32S16O18O and experimental line intensities of ro-vibrational transitions in the ν1 + ν2/ν2 + ν3 bands of 32S16O2, 34S16O2, 32S18O2 and 32S16O18O

The high resolution infrared spectra of the (SOO)-S-32-O-16-O-18 molecule were recorded for the first time with a Bruker IFS 120 HR Fourier transform interferometer and analysed in the region of 1550-1950 cm(-1) where the bands nu(1)+nu(2) and nu(2)+nu(3) are located. About 1050 and 1570 transitions were assigned in the experimental spectra with the maximum values of quantum numbers J(max.)/K-a(max.) equal to 64/16 and 58/19 to the bands nu(1)+nu(2) and nu(2)+nu(3), respectively. The subsequent weighted fit of experimentally assigned transitions was made with the Hamiltonian model which takes into account the resonance interactions between the studied vibrational states. As the result, a set of 16 fitted parameters was obtained which reproduces the initial 1442 ro-vibrational energy values obtained from the assigned transitions with the d(rms)=3.7x10(-4) cm(-1). An analysis of more than 4050 experimental ro-vibrational line intensities of the nu(1)+nu(2) and nu(2)+nu(3) bands of (SO2)-S-32-O-16 was made, and a set of 7 effective dipole moment parameters was obtained which reproduce the initial experimental line intensities with the d(rms)=6.9%. Values of these parameters, being re-calculated to the values of corresponding parameters of the (SO2)-S-34-O-16, (SO2)-S-32-O-18 and (SOO)-S-32-O-16-O-18 species were used for calculation of line intensities in the nu(1)+nu(2) and nu(2)+nu(3) bands of these three isotopologues. A list of transitions with their line intensities in the region of 1550-1950 cm(-1) for the four mentioned species is generated. (C) 2017 Elsevier Ltd. All rights reserved.