High resolution study of the ν<sub>2</sub> band of sulfur dioxide
The ν<sub>2</sub> band is analyzed on the basis of the combination difference method. The high resolution FTIR spectrum of the SO<sub>2</sub> molecule in the region 400-700 cm<sup>-1</sup> is used for the analysis. More than 4500 lines with the maximum values of the quantum numbers <i>J</i> and <i>K</i><sub>a</sub> equal to 96 and 25, respectively, are interpreted. On this basis, 1294 vibrational-rotational energy levels of the state (010) are determined. As a result of solution of the inverse spectroscopic problem with these levels, 32 effective Hamiltonian parameters are obtained, which allow us to reproduce the initial experimental data with the accuracy <i>d</i><sub>rms</sub> = 1.9 ( 10<sup>-4</sup> сm<sup>-1</sup>.