MICROWAVE SPECTRUM OF THE SF RADICAL

$^{1}$T. Amano, and E. Hirota, J. mol. Spectrosc. 45, 417 (1973).Author Institution:The microwave spectrum of the SF radical in the $^{2}\pi_{1/2}$ state has been assigned in the frequency region from 40 to 180 GHz, utilizing the small Zeeman effect induced by spin-uncoupling with the $^{2}\pi_{3/2}$ state to distinguish lines due to SF from those due to other species. The spectrum was observed in glow discharge in mixtures of OCS and $CF_{4}$. Previous $measurements^{1}$ of the spectrum in the $^{2}\pi_{3/2}$ state were extended to the 180 GHz region. Transition frequencies in both states were analyzed simultaneously and precise molecular constants including the rotational constant. $B_{0}$, and the centrifugal distortion constant, $D_{0}$, were obtained. The magnetic hyperfine coupling constants, a, b, c, and d of the fluorine nucleus interaction with the electron spin were all determined. An extremely small A-doubling constant was obtained, which suggests that close-lying $^{2}\Sigma^{+}$ and $^{2}\Sigma^{-}$ states are both contributing to the $\Lambda$-doubling