# HIGH-RESOLUTION VIBRATION-ROTATION SPECTROSCOPY OF SUBSTITUTED $METHANES^{*}$

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 Title: HIGH-RESOLUTION VIBRATION-ROTATION SPECTROSCOPY OF SUBSTITUTED $METHANES^{*}$ Creators: Qingshi, Zhu; Dubs, M.; Steinfeld, J. I. Issue Date: 1981 Publisher: Ohio State University Abstract: The vibration-rotation spectrum of the $v_{2}$ and $v_{5}$ fundamentals of $CDF_{3}$, the $v_{1}$ fundamental of $CBrF_{3}$, and the $v_{4}$ fundamental of $CD_{4}$ have been recorded using a Nicolet 7199 Fourier Transform Infrared Spectrometer. In addition, the Q-branch and several R(J) and P(J) sub-bands of each of these transitions have been investigated using a tunable semiconductor diode laser spectrometer. In $v_{2} (CDF_{3})$, the Q-branch and the K-structure in the P(J) subbands are resolved and assigned for the first time. Constants derived for this band are (in $cm^{-1}$) \begin{eqnarray*} v_{2} = 1111.1823_{6} \quad \alpha_{2}^{B} = 0.001646_{11} \quad D_{\alpha}^{J} = (2.5+0.5) \times 10^{-7} \\ A_{2}  =0.018623_{4} \quad \alpha{ _{2}}^{A}- \alpha _{2}^{B} = 0.001238_{9} \quad D_{2}^{J} = (3.4+0.5) \times 10^{-7}; \\ B_{2} = 0.32928_{2} \quad D_{2}{^{J}} =D_{D}{^{J}} = (9+4) \times 10^{-8} \end{eqnarray*} these are nearly 100 times more precise than those reported in previous $work.^{1}$ Improved constants will also be reported for $CBrF_{3}$ and $CD_{4}$. Description: $^{*}$Supported by the National Science Foundation. $^{1}$N.J. Fyke, P. Lockett, J.K. Thompson, and P. M. Wilt, J. Mol. Spectroscopy 58, 87 (1975). Author Institution: URI: http://hdl.handle.net/1811/11527 Other Identifiers: 1981-ME-13