ROTATIONAL ANALYSIS OF BANDS OF THE A-X AND B-X SYSTEMS of GeF
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Date
1972
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Ohio State University
Abstract
Emission spectra of GeF, excited in a discharge in flowing $GeF_{4}$ vapour, have been photographed under high resolution, and rotational analyses have been carried out for various sub-bands of the A-X and B-X systems. The principal molecular constants for $^{74}GeF$ are as follows: $(cm^{-1}$, except $r_{e}$) \begin{tabular}{@{}llllll@{}} & $T_{0}$ &$\Delta G_{1/2}$ &$B_{e}$ &$\alpha_{e}$ & $r_{e}$\\ $B^{2}\Sigma+$ & 35076.3 & 789.9 & 0.3938 & 0.0020 & 1.683 {\AA}\\ $A^{2} \Sigma+$ & 23190.84 &410.75 & 0.32033 & 0.00299 & 1.8660\\ X ${^{2} \Pi_{3/2}}$& 935.16 & 661.07 & 0.36657 & 0.00266 & 1.7443\\ ${^{2} \Pi_{1/2}}$ & 0.00 & 659.42 & 0.36575 & 0.00266 & 1.7463\\ \end{tabular} The states A and X are in the relationship of pure precession, with $\gamma (A^{2}\Sigma)$ and p $(X^{2}\Pi_{1/2})$ being of similar magnitude. The B-X system overlaps and interacts with a newly-discovered system of weak red-degraded bands; because of the complicated Ge isotope structure it has not been possible to analyze the interactions in detail, but experiments with separated $^{74}GeF$ are in progress, which, it is hoped, will clarify the patterns. The new state seems to be a case (b)$^{2}\Pi$ state, though $^{4}\Sigma^{-}$ cannot be ruled out.
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Author Institution: Department of Chemistry, University of British Columbia