First analysis of the rotationally-resolved ν2 and 2ν2-ν2 bands of sulfur dioxide, 33S16O2

• Published in: Journal of molecular spectroscopy 2017-03, Vol.333 (C), p.19-22
• Main Authors: Blake, T.A., Flaud, J.-M., Lafferty, W.J.
• Format: Article
• Language: English
• Subjects: High resolution Fourier transform infrared spectroscopy; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; MATERIALS SCIENCE; Ro-vibrational constants; Sulfur dioxide; Sulfur-33 isotope
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1016/j.jms.2016.12.011

[Display omitted] •The first rotationally-resolved infrared spectrum of 33-S, sulfur dioxide has been recorded.•Transitions from ν2 and 2 ν2–ν2 bands have been assigned.•The energy levels of the ν2 and 2 ν2 states have been fit to a Watson-type Hamiltonian.•Combination differences were used to fit the ground state constants for 33SO2. A Fourier transform spectrum of sulfur dioxide 33S16O2 has been recorded in the 18.3μm spectral region at a resolution of 0.002cm−1 using a Bruker IFS 125HR spectrometer leading to the observation of the ν2 and 2ν2-ν2 vibrational bands of the 33S16O2 molecule. The corresponding upper state ro-vibrational levels were fit using Watson-type Hamiltonians. In this way it was possible to reproduce the upper state ro-vibrational levels to within the experimental uncertainty; i.e., ∼0.20×10−3cm−1. Very accurate rotational and centrifugal distortion constants were derived from the fit together with the following band centers: ν0 (ν2)=515.659089(50) cm−1, ν0 (2ν2)=1030.697723(20) cm−1.