High-Resolution Infrared Spectra of the ν2, ν3, ν4, and 2ν3 Bands of 32S16O3

✍ Scribed by Arthur Maki; Thomas A. Blake; Robert L. Sams; Nicolae Vulpanovici; Jeffrey Barber; Engelene T.H. Chrysostom; Tony Masiello; Joseph W. Nibler; Alfons Weber

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 183 KB
• Volume: 210
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.2001.8454

✦ Synopsis

New measurements are reported for the infrared spectrum of sulfur trioxide, 32 S 16 O 3 , with resolutions ranging from 0.0015 cm -1 to 0.0025 cm -1 . Rovibrational constants have been measured for the fundamentals ν 2 , ν 3 , and ν 4 and the overtone band 2ν 3 . Comparisons are made with the earlier high-resolution measurements on SO 3 , and the high correlation among some of the constants related to the Coriolis coupling of the ν 2 and ν 4 levels is discussed in order to understand the areas of disagreement with the earlier work. Splittings of some of the levels are observed and the splitting constant for K = 3 of the ground state is determined for the first time. Other observed splittings include the K = 1 levels of 2ν 3 (l = 2), the K = 2 levels of ν 3 and ν 4 , and the K = 3 levels of ν 2 . The analysis shows that there are level crossings between the l = 0 and l = 2 states of 2ν 3 that allow one to determine the separation of the subband centers for these two states even though access to the l = 0 state from the ground state is electric-dipole forbidden. This is a generalized phenomenon that should be found for many other molecules with the same symmetry. The l-type resonance constant, q 3 , that causes the splitting of the l 3 = ±1, k = ±1 levels of ν 3 also couples the l 3 = 0 and 2 states of 2ν 3 .