THE MICROWAVE SPECTRUM OF DISILANYL FLUORIDE$^{\ast}$
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Date
1964
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Ohio State University
Abstract
About fifty a- and b-type transitions have been measured and assigned for disilanyl fluoride $(Si_{2}H_{5}F)$. Many of the lines are split due to tunnelling through the barrier to internal rotation about the Si--Si bond. Analysis of these splittings gives a barrier value of 1,048 cal/mole. The ground-state rotational constants of the A and E levels are: $\begin{array}{ll}A_{A} = 16,025.78 Mc & A_{E} = 16,023.66 Mc\\ B_{A} = 3,338.26 Mc & B_{E} = 3,338.25 Mc \\C_{A} = 2,948.60 Mc & C_{E} = 2,948.60 Mc\end{array}$ Structural calculations give a preliminary value for the Si-Si bond distance of $2.33 {\AA}$. This corresponds to a single-bond value and is consistent with the low barrier. A preliminary value of the dipole moment is $\mu = 1.2_{3}D$. $^{\ast}$This research was made possible by support extended Harvard University by the Office of Naval Research.
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Author Institution: Department of Chemistry, Harvard University