# ANALYSIS OF THE $5^{1}_{0}, 6^{1}_{0}$ AND $9^{1}_{0}$ BANDS OF $CH_{2}DF$

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 Title: ANALYSIS OF THE $5^{1}_{0}, 6^{1}_{0}$ AND $9^{1}_{0}$ BANDS OF $CH_{2}DF$ Creators: Lewis-Bevan, W.; Eggers, D. F.; Stork, W. D.; Gerry, Michael C. L. Issue Date: 1990 Publisher: Ohio State University Abstract: In a previous $paper,^{1}$ Eggers et al. outlined the initial assignment and analysis of the two stronger fundamentals of $CH^{2}DF$ in the $9-11 \mu m$ region, $\nu_{5}$ and $\nu_{6}$. In this paper we report the progress of the analysis of the two strong fundamentals and the inclusion of the weak fundamental. The data were recorded using both a high resolution BOMEM DA3.002 FT-IR instrument and a tunable diode laser. The diode laser was used to improve the resolution, sensitivity, and signal to noise of the very weak $^{r}Q$. branches of the $\nu_{9}$ fundamental, first observed in the FT-IR spectrum. The analysis has been extended to include the very weak $v_{9}$ fundamental. The strongest band, $v_{5}$, has its band origin near $1055.5 cm^{-1}$. This is a hybrid ab-type band, but only A-type transitions have been assigned. The $v_{6}$ band is slightly weaker and is centered near $938.3 cm^{-1}$. In this band, strong A-type and somewhat weaker B-type transitions have been assigned. Finally, some very weak $^{r}Q-branches$ (C-type) have been assigned in the $\nu_{9}$ band of the molecule. The diode laser data were recorded in the region of $^{r}Q3$ through $^{r}Q5$, while very weak FT-IR data exist up to $^{r}Q7$. The approximate band origin of the $\nu_{9}$ band is $1132 cm^{-1}$. There are strong interactions between the $K_{a} = 10$ and $K_{a} = 8$ levels of $6^{1}$ and $5^{1}$ states respectively. The interaction between the $^{5}1$ and $^{9}1$ states is interesting since no evidence of $^{r}R-branch$ transitions has been detected so far. Molecular constants will be reported for the ground state and all three excited vibrational states of the molecule. Description: $^{1}$ D.F. Eggers, W. Lewis-Bevan, M.C.L., Gerry, M.S. Tobin and T.W. Daley, Paper TB1 at the Forty-Third Symposium on Molecular Spectroscopy, June 13-17, 1988. Author Institution: Department of Chemistry and Biochemistry, Southern Illinois University. Carbondale; Department of Chemistry BG-10, University of Washington; Department of Chemistry, University of British Columbia URI: http://hdl.handle.net/1811/18109 Other Identifiers: 1990-MF-7