High resolution study of the ν₁+2ν₂−ν₂ and 2ν₂+ν₃−ν₂ “hot” bands and ro-vibrational re-

详细信息    查看全文

• 作者：O.N. Ulenikov ; O.V. Gromova ; E.S. Bekhtereva ; I.B. Bolotova ; C. Leroy ; V.-M. Horneman ; S. Alanko
• 关键词：Sulphur dioxide ; High-resolution spectra ; Spectroscopic parameters
• 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：112
• 期：3
• 页码：486-512
• 全文大小：965 K

文摘

The weak “hot” absorption bands, ν₁+2ν₂−ν₂ and 2ν₂+ν₃−ν₂, were analysed with high resolution using the Fourier transform interferometer Bruker IFS-120 HR. In order to make possible an analysis of the ν₁+2ν₂−ν₂ and 2ν₂+ν₃−ν₂ bands, as the first step, we re-analysed considerably the stronger “cold” bands, ν₁+ν₂ and ν₂+ν₃, 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 J^max. = 78, K_a^max. = 27 and J^max. = 68, K_a^max. = 24 for the bands ν₁+ν₂ and ν₂+ν₃, respectively, that is considerably higher than in the earlier studies of corresponding bands (J^max. = 33, K_a^max. = 7 and J^max. = 50, K_a^max. = 16 for the same bands, ν₁+ν₂ and ν₂+ν₃, respectively). A strong local resonance interaction with the 3ν₂ 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 ν₁+2ν₂−ν₂ and 2ν₂+ν₃−ν₂ bands were assigned, and about 870 and 930 transitions (553 and 540 upper state ro-vibrational energy values) with J^max. = 60 and K_a^max. = 20 and J^max. = 59 and K_a^max. = 16 were assigned to the ν₁+2ν₂−ν₂ and 2ν₂+ν₃−ν₂ 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).