# THE HIGH RESOLUTION SPECTRUM AND ROTATIONAL ANALYSIS OF THE $\nu_{6}$ BAND OF CARBONYL FLUORIDE

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 Title: THE HIGH RESOLUTION SPECTRUM AND ROTATIONAL ANALYSIS OF THE $\nu_{6}$ BAND OF CARBONYL FLUORIDE Creators: Thakur, K. B.; Friedl, R. R.; Rinsland, C. P.; Devi, V. Malathy; Rao, K. Narahari Issue Date: 1986 Publisher: Ohio State University Abstract: The asymmetric top molecule $COF_{2}$ has gained additional interest as the presence of the $\nu_{1}$ and $\nu_{6}$ bands of it have been observed recently in $-0.01 cm^{-1}$ resolution spectra of the $stratosphere^{1}$. To provide spectroscopic parameters needed for the analysis of $COF_{2}$ absorption in such atmospheric spectra, $0.005 cm^{-1}$ resolution laboratory spectra of the $\nu_{6}$ band have been recorded at room temperature and a full rotatinal analysis has been performed. The laboratory data were obtained with a Bomen Fourier transform spectrometer at the Jet Propulsion Laboratory. Lines in the $\nu_{1}$ band of OCS were used for calibration. Although the strong Q branch at $774 cm^{-1}$ is only partially resolved in the laboratory data, most of the K structure of various J subgroups in the P and R branches is fully resolved. With the help of ground-state rotational constants obtained from the microwave data of $Carpenter^{2}$, around 1300 transition up to $J = 40$ have been assigned and fitted to a standard deviation of $0.0006 cm^{-1}$. By incorporating quartic and sextic centrifugal distortion coefficients of Watson's reduced Hamiltonian into the analysis, upper state rotational constants A, B, and C have been determined to an accuracy better than $10^{-5} cm^{-1}$. The results will be discussed along with the asymmetry splitting of the low K transitions for each J. This work was supported under USAF Agreement RES D5-674 with the Air Force Geophysics Laboratory. Description: $^{1}$ C. P. Rinsland et al., preceding abstract. $^{2}$ J. H. Carpenter, J. Mol. Spectrosc., 50, 182-201 (1974). Address of Thakur and Rao: Physics Department, The Ohio State University, 174 West 18th Avenue, Columbus, Ohio, 43210. Address of Friedl: Jet Propulsion Laboratory, Mail Stop 183-601, 4800 Oak Grove Drive, Pasadena, California, 91109. Address of Rinsland: NASA Langley Research Center, Mail Stop 401A, Hampton, Virginia, 23665-5225. Address of Malathy Devi: Physics Department, college of William and Mary, Williamsburg, Virginia, 23185. Author Institution: URI: http://hdl.handle.net/1811/16974 Other Identifiers: 1986-RB-7