Knowledge Bank

The microwave spectrum of $CH3SiHD2$ has been studied and from the splitting of the J $\ne$ 1 lines the barrier to internal rotation has been determined, using an extension of the Wilson, Lin and Lide $theory.1$ If the barrier is assumed to be $V3/2(1-\cos 3\alpha )$, then $V3$ is 1630 $\pm$ 50 cal. If a $V6$ term of about 100 cal is assumed, of the form $V6/2(1-\cos 6a)$, then $V3$ is 1595 $\mu$ 50 cal. This barrier is in agreement with $Kivelson\prime s2$ work, where the barrier, 1959 $\pm$ 50 cal, was obtained from a study of the $J=O-1$ satellites of $CH3SiH3$. A dipole moment study and structural analysis have also been carried out for this molecule.