High Resolution Infrared Spectra of the Ņ2 Ņ3, Ņ4, and 2Ņ3 Bands of 32S16O3

Published

December 1, 2001

Author(s)

A G. Maki, Thomas A. Blake, R L. Sams, N Vulpanovici, J Barber, E T. Chrysostom, Tony Masiello, J Nibler, A Weber

Abstract

New measurements are reported for the infrared spectrum of sulfur trioxide, ³²S¹⁶O₃, with resolution ranging from 0.0015 cm^-1 to 0.0025 cm^-1. Rovibrational constants have been measured for the fundamentals Ņ₂, Ņ₃, and Ņ₄, and the overtone band 2Ņ₃. 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 Ņ₂ and Ņ₄ 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 2Ņ₃(l=2), the K=2 levels of Ņ₃, and Ņ₄, and the K = 3 levels of Ņ₂. The analysis shows that there are level crossings between the l = 0 and l=2 states of 2Ņ₃ that allow one to determine the separation of the sub-band 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 that couples the l=0 and 2 states is roughly the same in magnitude as q₃ which causes the splitting of the l=1 levels of the Ņ₃ fundamental.

Citation

Journal of Molecular Spectroscopy

Volume

210

Issue

No. 2

Pub Type

Journals

Keywords

high resolution, infrared, spectroscopy, spectrum, sulfur trioxide

Citation

Maki, A. , Blake, T. , Sams, R. , Vulpanovici, N. , Barber, J. , Chrysostom, E. , Masiello, T. , Nibler, J. and Weber, A. (2001), High Resolution Infrared Spectra of the Ņ₂ Ņ₃, Ņ₄, and 2Ņ₃ Bands of ³²S¹⁶O₃, Journal of Molecular Spectroscopy (Accessed July 26, 2024)