Knowledge Bank

“The assignment of forty \emph{a} and \emph{b}-type lines has yielded the following values for the three rotational constants and the four (in this case) independent first order centrifugal distortion constants: [ \begin{array}{lll} A = 26,243.15_{5}Mc/s& D_{J} = 1.18 \times 10^{-4};Mc/s\ B=1,443.611’’& D_{JK} = 1.588 \times 10^{-2}{‘ ‘}\ C=1,368.129’’ &D_{K} = 1.160’’\ &\delta_{J} = 1.58 \times 10^{-5}{‘ ‘} \end{array} ] The remaining two distortion constants, dependent on those above, are $R5=1.58\times 10-3$ Mc and $R=1\times 10-6$ Mc. The inertial defect $\Delta =Ic-Ia-Ib$ is +0.0572 amu {A}$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$, indicating that the molecule is planar. Stark effect measurements have yielded a diploe moment of 4$4.38\pm 0.04$ D, with $\mu a=4.28\pm 0.04$ D and $\mu b=0.95\pm 0.02$ D. “