THE MILLIMETER/SUBMILLIMETER SPECTRUM OF LISH($\tilde{X}^{1}A^{\prime})$: FURTHER INVESTIGATIONS OF THE METAL-SULFUR BOND

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2002

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Ohio State University

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The pure rotational spectra of LiSH ($\tilde{X}^{1}A^{\prime})$ and two of its isotopomers ($^{6}$LiSH, LiSD) were recorded using millimeter/submillimeter-wave direct absorption techniques. The molecule was produced by reacting lithium vapor with $H_{2}S$ in the presence of a d.c. discharge. Transition ranging from $J = 1 \rightarrow 2$ to $J = 13 \rightarrow 14$, spanning the region of 73-520 GHz, were measured for $^{7}$LiSH, as well as 3-4 transitions for the $^{6}$Li and deuterium isotopomers. The spectra showed an extensive $K_{a}$ ladder structure for the three species, which is consistent with the molecule being an asymmetric top. Rotational constants for all three molecules have been determined, as well as $r_{0}$ and $r_{m}{^{(1)}}$ structures for LiSH. This study shows that this molecule is bent, with $\Theta = 93^{\circ}$ and therefore is significantly different from the quasilinear LiOH. This structural change likely results from more covalent bonding in LiSH.

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Author Institution: Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona

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