THE MILLIMETER/SUBMILLIMETER SPECTRUM OF $BaSH(\tilde{X}^{2}A^{\prime}$): EVEN FURTHER INVESTIGATIONS OF THE METAL-SULFUR BOND
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Date
2003
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Ohio State University
Abstract
The pure rotational spectrum of $BaSH (\tilde{X}^{2}A^{\prime})$ and one of its isotopomers, BaSD, were recorded using millimeter/submillimeter wave direct absorption techniques in the range 320-364 GHz. This radical was produced by reacting barium vapor with $H_{2}S$ in the presence of a d.c. discharge. Ten transitions, ranging from $J=66 \to 67$ to $75 \to 76$, were measured for BaSH, as well as 5 transitions for the deuterium isotopomer. The spectra exhibit complex $K_{a}$ ladder structure for both molecules, consistent with a bent geometry. Spin- rotation splittings of approximately 54 MHz were also observed in every transition. Rotational and fine structure constants have been determined for both isotopomers, as well as an $r_{0}$ structure for BaSH. This study shows that barium hydrosulfide is bent with an angle of $\Theta = 88^{\circ}$, and therefore is significantly different from linear BaOH. This structural change indicates more covalent bonding character in the BaSH, relative to its hydroxide analog.
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Author Institution: Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona