THE HIGH RESOLUTION RAMAN SPECTRUM OF $\nu_{1}$ AND $\nu_{4}$ OF $CD_{3}C1$ AND THE DETERMINATION OF $A_{0}$
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Date
1977
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Ohio State University
Abstract
High resolution Raman spectra of $CD_{3}Cl$ vapor has been recorded ($\Delta \nu$ between 0.05 to $0.30 cm^{-1}$). The $\nu_{1}(A_{1})$ and $\nu_{4}$ (E) hands will be discussed here. The two sets of subbands ($\Delta K = \pm 1, \Delta K = \pm 2$) allowed for a $C_{3v}$ type molecule permit a direct determination of the axial rotational constant $A_{0}$. Using the following ground state combination differences on the observed Q branch maxima, $$ \frac{^{R}Q_{K-1}- {^{O}Q}_{K+2}}{(6K+3)}=\frac{^{S}Q_{K-1}- {^{P}Q}_{K+2}}{(6K+3)}=(A_{0} - B_{0}) -D_{K} (2K^{2} + 2K + 5) $$ we obtained the following preliminary results: \begin{eqnarray*} A_{0} &=& 2.610 \pm 0.003 cm^{-1} \\ D_{k} &=& (5 \pm 3) \times 10^{-5} cm^{-1} \end{eqnarray*} No evidence of the isotopic splitting was observed, so an effective $B_{0}$ of 0.360 127 $cm^{-1}$ was used. The $\nu_{1}$ band Q branch was resolved and showed its K components resolved with clear intensity alternation visible for K = 3p levels.
Description
Author Institution: Department of physics, University of Tennessee; Department of Chemistry, University of Tennessee