Knowledge Bank

We have measured the $\Delta J=0$, 1-doubling transitions in the first excited state of the bending vibration of $^{16}O^{12} C^{32} S $ with the molecular beam electric resonance method. A least squares computer program was used to fit the transition frequencies (with an experimental accuracy of 100 Hz) for $J=1$ through 12 to the equation $$ \nu = \frac{(v_{2} +1)}{2} [q_{v} J(J+1) + \mu_{v} J^{2} (J+1)^{2} + \Delta HJ^{3} (J+1)^{3} ] $$ The $X2$ of the fit was 2.5 and the resulting constants are: $qv=6361.413(5)kHz$, $\mu v=-4.27(5)Hz$, and , with the uncertainties representing twice the standard deviations. The Zeeman effect was measured for J = 3, 4, and 5 in a magnetic field $B=8 $kG. The results for the magnetic moment $(G\to )$ and the susceptibility $(X\to )$ tensor are: \begin{eqnarray*} g_{1} = -0.02930(4); g_\parallel -g_\perp =0.0905(5); \ g_{xx}-g_{yy}=+ 0.00023(2); X_\perp - X_\parallel =+2.38(10) ^{kHz} / (kG)^{2} \ \mbox{ and } X_{xx} - X_{yy} =-0.03(3) ^ {kHz}/(kG)^{2}. \end{eqnarray*} The experimental accuracy in the frequencies was 300 - 500 Hz and the signal to noise ratio was about 4. The provisional result for the electric dipole moment is: $\mu =0.70430(6)D$.