| THE HIGH RESOLUTION INFRARED SPECTRUM OF THE LOWER WAVENUMBER BANDS OF $^{34}$SO$_2$ (2008) | |||||||||
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| Author Institution: Optical Physics Laboratory, NIST, Gaithersburg, MD 20899, USA; Laboratoire Inter Universitaire des Systemes Atmospheriques; CNRS, Universite Paris 12, 61 Av du General de Gaulle, 94010 Creteil; Cedex France; Pacific Northwest Laboratory, P.O. Box 999, Richland, WA 99352, USA; Univ. Cheikh Anta Diop, Ecole Superieure Polytechnique. BP 5085, Dakar, Senegal. The infrared spectrum of sulfur dioxide becomes of importance after volcanic eruptions in which large amounts of SO$_2$ are emitted into the atmosphere. While the spectrum of the normal species, $^{32}$SO$_2$, has been very well studied and an excellent set of molecular constants obtained, this is not the case for the rarer isotopic species, $^{34}$SO$_2$, the abundance of which is about 4.2\% of the normal species. In order to improve our knowledge of the $^{34}$SO$_2$ spectrum we have studied a sample of SO$_2$ enriched to 95\% in $^{34}$S over a wavenumber region including all the fundamental bands, the relatively strong combination bands $\nu_2$+$\nu_3$ and $\nu_1$+$\nu_3$ as well as the weaker 2$\nu_1$+$\nu_3$ and 2$\nu_3$ bands. The resolution was 0.0019 cm$^{-1}$. The two lowest hot bands of the bending mode, $\nu_2$, have also been assigned as well as the hot bands of the other two fundamental bands and the $\nu_1$+$\nu_2$+$\nu_3$-$\nu_2$ band. The spectroscopic constants obtained will be presented. | |||||||||
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