6533b7ddfe1ef96bd1273c65

RESEARCH PRODUCT

High resolution study of the and “hot” bands and ro-vibrational re-analysis of the polyad of the 32SO2 molecule

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Abstract The weak “hot” absorption bands, ν 1 + 2 ν 2 − ν 2 and 2 ν 2 + ν 3 − ν 2 , were analysed with high resolution using the Fourier transform interferometer Bruker IFS-120 HR. In order to make possible an analysis of the ν 1 + 2 ν 2 − ν 2 and 2 ν 2 + ν 3 − ν 2 bands, as the first step, we re-analysed considerably the stronger “cold” bands, ν 1 + ν 2 and ν 2 + ν 3 , which are located in the same spectral regions. As the result of analysis we obtained about 2650 and 2050 transitions (1069 and 1001 upper state ro-vibrational energy values) with Jmax. = 78, Kamax. = 27 and Jmax. = 68, Kamax. = 24 for the bands ν 1 + ν 2 and ν 2 + ν 3 , respectively, that is considerably higher than in the earlier studies of corresponding bands (Jmax. = 33, Kamax. = 7 and Jmax. = 50, Kamax. = 16 for the same bands, ν 1 + ν 2 and ν 2 + ν 3 , respectively). A strong local resonance interaction with the 3 ν 2 band was taken into account, and the set of parameters that reproduce the initial experimental data with an accuracy close to experimental uncertainties, was obtained. The weak ν 1 + 2 ν 2 − ν 2 and 2 ν 2 + ν 3 − ν 2 bands were assigned, and about 870 and 930 transitions (553 and 540 upper state ro-vibrational energy values) with Jmax. = 60 and Kamax. = 20 and Jmax. = 59 and Kamax. = 16 were assigned to the ν 1 + 2 ν 2 − ν 2 and 2 ν 2 + ν 3 − ν 2 bands, respectively. A complete list of assigned transitions is presented, and corresponding spectroscopic parameters are obtained from the fit of assigned transitions (upper energy values).