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Analysis of the Ņ2, Ņ4 Infrared Hot Bands and Ņ1 CARS Spectrum of 34S16O3

Published

Author(s)

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

Abstract

High-resolution (0.0015 cm-1) infrared spectroscopy has been used to study the 34S16O3 IR-active hot bands originating from the Ņ2 and Ņ4 bending mode levels and terminating in the states 2Ņ2 (I = 0), Ņ2 + Ņ4 (I = 1), and 2Ņ4 (I = 0, 2). The upper states are strongly coupled via Fermi resonance and indirect Coriolis interactions to the Ņ1 symmetric stretching mode levels that are only directly accessible from the ground state via a Raman-active transition. A Coherent anti-Stokes Raman (CARS) spectrum of Ņ1 for 34S16O3 is presented which is dramatically different from the corresponding one for 32S16O3. From the infrared transitions, accurate rovibrational constants are deduced for all the mixed states, leading to deperturbed values for Ņ1, χ1B, and χ1C of 1064.920(84), 0.000 834 5(54), and 0.000 410(11) cm-1, respectively. The uncertainties in the last digits are shown in parentheses and represent two standard deviations. These parameters reproduce the unresolved Q-branch contour of the CARS spectrum very well. Various other rotational and vibrational parameters have been determined, leading to values of Be = 0.349 760 6(33) cm-1 and re = 141.734 70(68) pm, values that are identical (within experimental error) to those found for 32S16O3.
Citation
Journal of Molecular Spectroscopy
Volume
218
Issue
No. 2

Keywords

CARS, coherent Raman, infrared, spectrum, sulfur trioxide, sulfur-34

Citation

Barber, J. , Chrysostom, E. , Masiello, T. , Nibler, J. , Maki, A. , Weber, A. , Blake, T. and Sams, R. (2003), Analysis of the &#325;<sub>2</sub>, &#325;<sub>4</sub> Infrared Hot Bands and &#325;<sub>1</sub> CARS Spectrum of <sup>34</sup>S<sup>16</sup>O<sub>3</sub>, Journal of Molecular Spectroscopy (Accessed April 13, 2024)
Created February 1, 2003, Updated February 17, 2017