High resolution study of the 3ν1 band of SO2

The second overtone band 3 nu(1) of sulfur dioxide has been studied for the first time with high resolution rotation-vibration spectroscopy. About 3000 transitions involving about 900 upper state energy levels with J(max) = 66 and K-a(max) = 24 have been assigned to the 3 nu(1) band. In the analysis, an effective Hamiltonian taking into account accidental interactions between the vibrational states (300), (220), and (041) was used. The Watson operator in A-reduction and l(r) representation was used in the diagonal blocks of the Hamiltonian. As the result of analysis a set of parameters reproducing the initial experimental data with the rms = 0.00028 cm(-1) was obtained. (C) 2009 Elsevier Inc. All rights reserved.