High Resolution Infrared Spectra of the v2, v3, v4 and 2v3 Bands of 32S16O3
New measurements are reported for the infrared spectrum of sulfur trioxide, 32S16O3, with resolutions ranging from 0.0015 cm-1 to 0.0025 cm-1. New rovibrational constants have been measured for the fundamentals v2, v3, and v4, and the overtone band 2v3. Comparisons are made with the earlier high resolution measurements on SO3 and the high correlation among some of the constants related to the Coriolis coupling of the v2 and v4 levels is duscussed in order to understand the areas of disagreement with the arlier work. Splittings of some of the levels are observed and hte splitting constant for K = 3 of the ground state is determined for the first time. Other observed splittings include the K = 1 levels of 2v3 (I = 2), the K = 2 levels of the v3 and v4 states and the K = 3 levels of v2. This analysis shows that there are level corssings between the I = 0 and I = 2 states of 2v3 that allow one to determine the separation of the sub-band centers for those two states even thoug the I = o state is a dark state. This is a generalized phenomenon that should be found for many other molecules with the same symmetry. The I-type resonance constant that couples the I = 0 and 2 states is roughly the same as q3 which causes the splitting of the I = 1 levels of the v3 fundamental.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15001291
- Report Number(s):
- PNNL-SA-35117; 1950; 1950a; KP1504020; TRN: US200412%%10
- Journal Information:
- Journal of Molecular Spectroscopy, 210:240-249, Vol. 210
- Country of Publication:
- United States
- Language:
- English
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