Knowledge Bank

The microwave spectra of three isotopic species of the unstable molecule thiocarbonyl fluoride, $SCF2$, have been investigated in the frequency range 6.7--18.4 GHz using a pulsed molecular beam microwave Fourier transform spectrometer. A $\mathrm{<mrow\; data-mjx-texclass="ORD">19</mrow>}F$ nuclear spin-rotation interaction as well as a rather large direct $\mathrm{<mrow\; data-mjx-texclass="ORD">19</mrow>}F$ nuclear spin-spin interaction have been observed, and the $\mathrm{<mrow\; data-mjx-texclass="ORD">19</mrow>}F$ spin-rotation constants have been evaluated. For the $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C$ isotopomer, the splitting patterns due to the two $\mathrm{<mrow\; data-mjx-texclass="ORD">19</mrow>}F$ nuclei and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C$ nucleus have been observed but not completely resolved. A ground state average ($r2$) structure and an estimate of the equilibrium ($re$) structure have been obtained.