On the high resolution spectroscopy and intramolecular potential function of SO2

International audienceTwo weak stretching bands, nu(1) + 3 nu(3) and 3 nu(1) + nu(3), of the sulfur dioxide molecule have been recorded at high resolution and analyzed for the first time with using a Fourier transform Bruker IFS-120 HR interferometer.About 1000 transitions with J(max.) = 51, K-a(max.) = 16, and 900 transitions with J(max.) = 53. K-a(max.) = 16 have been assigned to the bands nu(1) + 3 nu(3) and 3 nu(1) + nu(3), respectively. Analysis of the recorded spectra was made using the model of isolated vibrational states. Parameters obtained from the fit reproduce the initial experimental ro-vibrational energies with the rms deviation of 0.0006 and 0.0012 cm(-1) for the bands, 3 nu(1) + nu(3) and nu(1) + 3 nu(3), respectively. The problem of determination of the intramolecular potential function of SO2 is discusse