| MILLIMETERWAVE AND FOURIER-TRANSFORM EMISSION SPECTRA OF THE BiS RADICAL (2008) | |||||||||
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| E. A. Cohen, D. M. Goodridge, K. Kawaguchi, E. H. Fink, and K. D. Setzer, J. Mol. Spectrosc. 239 (2006) 16-23.H. M. Pickett, J. Mol. Spectrosc. 148 (1991) 271-377.. Author Institution: Department of Chemistry, Okayama University, Okayama, Japan, 700-8530; Jet Propulsion Laboratory, California Institute of Technology; Pasadena, California 91109-8099; Physikalische Chemie-Fachbereich C, Bergische; Universitat Wuppertal, D-42097 Wuppertal, Germany. The millimeterwave rotational spectrum of BiS in its$\textit{X}_{1}~^{2}\Pi_{1/2}$ state was observed in the frequency range of 150-300 GHz. BiS was produced in a high-temperature oven by a discharge in a mixture of Bi vapor and CS2. A White-type multipath cell was used to enhance the absorption pathlength. Near infrared bands of the transition were measured by Fourier-transform emission spectroscopy in the 6400-7400 cm$^{-1}$ region, where BiS was produced by reaction of bismuth and sulfur vapor and excited by collisional energy transfer from the metastable $a^{1}\Delta_{g}$ electronic state of O$_{2}$. A simultaneous analysis of millimeterwave and FT data was carried out to give rotational, fine and hyperfine constants for the $\textit{X}_{1}~^{2}\Pi_{1/2}$ and $\textit{X}_{2}~^{2}\Pi_{3/2}$ states. Ninety seven rotational $\Delta J=1$ features from $J^\prime=23.5$ to $41.5$ and 545 NIR features representing assignments of a wide range of $J$'s were included in the fit. The hyperfine parameters are consistent with those of BiO} with slightly less unpaired electron density in the antibonding $\pi$ orbital on the Bi atom. Examples of the spectra will be shown. The fitting procedure with {\sc{spcat}}} and the resulting parameters will be discussed. | |||||||||
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