HIGH RESOLUTION ELECTRONIC SPECTOSCOPY OF THE $FS_{2}$ FREE RADICAL
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Date
1994
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Ohio State University
Abstract
Jet-cooled laser excitation spectra of the $\widetilde{A}^{2}A^{\prime}-\widetilde{X}^{2}A^{\prime\prime}$ bad system of the $FS_{2}$ free radical will be presented. This study represents the first spectroscopic observation of this species, which may be important in the dry etching of integrated circuits using $SF_{6}$ low pressure plasmas. High resolution spectra of several bands have been rotationally analyzed yielding precise molecular constants and structural data for the ground and electronically excited states. A few axis-switching transitions with $\Delta_{2}=0$ have been assigned, consistent with a calculated axis-switching angle of $5.3^{\circ}$. The electronic transition has $T_{\infty} =14.922 cm^{-1}$ and involves excitation of a non-boding electron localized on the terminal sulfur to a $\pi^{+}$ orbital delocalized over the S-S bond.
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Author Institution: Department of Chemistry, University of Kentucky