Analysis of Some Combination-Overtone Infrared Bands of 32S16O3

Published

June 1, 2004

Author(s)

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

Abstract

Several new infrared absorption bands for 32S16O3 have been measured and analyzed. The principal bands observed were v1 + v2 (at 1561 cm-1), v1 + v4 (at 1594 cm-1, v3 + v4 at 1918 cm-1), and 3v3 (at 4136 cm-1). Except for 3v3, these bands are very complicated because of (a) the Coriolis coupling between v2 and v4, (b) the Fermi resonance between v1 and 2v4, (c) the Fermi resonance between v1 and 2v2, (d) ordinary l-type resonance that couples levels that differ by 2 in both the k and l quantum numbers, and (3) the vibrational l-type resonance between the A1' and A2' levels of v3 + v4. The unraveling of the complex pattern of these bands was facilitated by a systematic approach to the understanding of the various interactions. Fortunately, previous work on the fundamentals permitted good estimates of many constants necessary to begin the assignments and the fit of the measurements. In addition, the use of hot band transitions accompanying the v3 band was an essential aid in fitting the v3 + v4 transitions since these could be directly observed for only one of four interacting states. From the hot band analysis we find that the A1' vibrational level is 3.50 cm-1 above the A2' level, i.e., r34 = 1.75236(7) cm-1. In the case of the 3v3 band, the spectral analysis is straight forward and a weak {Δ}k = ±2, {Δ}l3 = ±2 interaction between the l3 = 1 and l3 = 3 substates locates the latter A1' and A2' ghost states 22.55(4) cm-1 higher than the infrared accessible l3 = 1 E' state.

Citation

Journal of Molecular Spectroscopy

Volume

225

Issue

No. 2

Pub Type

Journals

Keywords

combination bands, high-resolution, infrared, overtone bands, sulfur trioxide

Citation

Maki, A. , Blake, T. , Sams, R. , Frieh, J. , Barber, J. , Masiello, T. , Chrysostom, E. , Nibler, J. and Weber, A. (2004), Analysis of Some Combination-Overtone Infrared Bands of ³²S¹⁶O₃, Journal of Molecular Spectroscopy (Accessed April 23, 2024)