# VIBRATIONAL SPECTROSCOPY OF ATMOSPHERIC RELEVANT HALOGENATED HYDROCARBONS: THE C-H-STRETCH VIBRATIONS OF CHLOROMETHYL

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 Title: VIBRATIONAL SPECTROSCOPY OF ATMOSPHERIC RELEVANT HALOGENATED HYDROCARBONS: THE C-H-STRETCH VIBRATIONS OF CHLOROMETHYL Creators: Blair, A. C.; Haber, T.; Nesbitt, David J. Issue Date: 2003 Publisher: Ohio State University Abstract: The symmetric stretch vibration $(3055.07723(63) cm^{-1})$ of chloromethyl radical has been characterized via tunable difference frequency IR absorption spectroscopy in a slit supersonic discharge expansion source with a resolution of $0.0001 cm^{-1}$. Rotational progressions for both nuclear spin isomers $(K = 0,1)$ and chlorine isotopes are observed and assigned. Rotational analysis and least squares fits to a Watson Hamiltonian have been performed with ground state values were taken from rotational $spectra^{a}$, yielding asymmetric top rotational, centrifugal distortion constants and isotope shifts for the vibrationally excited state. Searches at shot noise limited detection sensitivity have also been performed for the asymmetric C-H-stretch vibration $(3163-3232 cm^{-1})$, confirming theoretical predictions that this band is at least 25 times weaker then the corresponding symmetric stretch vibration. Description: $^{a}$Y. Endo, S. Saito, E. Hirota, Can. J. Phys. 62, 1347 (1984). Author Institution: JILA, University of Colorado URI: http://hdl.handle.net/1811/20795 Other Identifiers: 2003-MF-10