Infrared Spectra of the Fundamental Bands of 34SO2
EMSL Project ID
21290
Abstract
Thanks to advances in technology the abundance of sulfur dioxide in urban air has been greatly reduced during the last several decades. The infrared spectrum of the bands of the most abundant isotopic species, 32S16O2, have been well studied as high as the 003 vibrational level near 4000 cm-1. Surprisingly, although the isotopic abundance of 34SO2 is about 4%, almost no results are available for the isotopologue as can be checked in the HITRAN data base where only a handful of 34SO2 lines are listed and their quality is not assessed. The major interest in the spectrum of SO2 currently occurs after a volcanic eruption in which clouds of SO2 along with ashes and other debris are thrust high into the atmosphere and revolve around the earth. Since, in this case, many of the lines of the 32S16O2 spectrum are nearly saturated, it would be highly useful to have lines of the bands of the minor isotopic species recorded and assigned so that they can be included in the HITRAN tables which is an atlas of atmospheric spectral lines. We propose here to record and assign the 3 fundamental bands of 34SO2 around 500, 1140 and 1350 cm-1 as well as the overtone of the bending vibration at 1000 cm-1 since it is in a weak resonance with the stretching vibrations. The spectrum of the rather strong combination band ν1 + ν3 will also be studied. In all cases the best possible set of line positions and line intensities will be generated and contributed to the HITRAN data base.
Project Details
Project type
Exploratory Research
Start Date
2006-09-08
End Date
2007-09-10
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Flaud J, WJ Lafferty, and RL Sams. 2009. "Line Intensities for the v1, v3, and v1 + v3 Bands of 34SO2." Journal of Quantitative Spectroscopy and Radiative Transfer 110(9-10):669-674.
Lafferty W, J Flaud, EHA Ngom, and RL Sams. 2009. "(SO2)-S-34-O-16: High-resolution analysis of the (030),(101), (111), (002) and (201) vibrational states; determination of equilibrium rotational constants for sulfur dioxide and anharmonic vibrational constants ." Journal of Molecular Spectroscopy 253(1):51-54.
Lafferty W, J Flaud, RL Sams, and EHA Ngom. 2008. "High Resolution Analysis of the Rotational Levels of the (000), (010), (100), (001), (020), (110) and (011) Vibrational States of 34S 16O2." Journal of Molecular Spectroscopy 252(1):72-76. doi:10.1016/j.jms.2008.06.013