# VIBRATION-ROTATIONAL INTERACTIONS IN THE STATES $\nu_{2} = 1$ and $\nu_{5}=1$ OF $^{13}CH_{3}F$.

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 Title: VIBRATION-ROTATIONAL INTERACTIONS IN THE STATES $\nu_{2} = 1$ and $\nu_{5}=1$ OF $^{13}CH_{3}F$. Creators: Papoušek, D.; Demaison, J.; Wlodarczak, G.; Pracna, P.; Klee, S.; Winnewisser, M.; Belov, S. P.; Tretyakov, M. Yu.; Chapovsky, P. Issue Date: 1993 Publisher: Ohio State University Abstract: The submillimeterwave spectra were measured of the rotational transitions in the $\nu_{2}=1$ and $\nu_{5}=1$ states of $^{13}CH_{3}F$. Almost 3000 lines were assigned in the high resolution infrared spectra of the $\nu_{2}$ and $\nu_{5}$ bands including 142 lines of the $Ak = \pm 2$ forbidden transitions. A variational approach was applied to the analysis of the $\nu_{2}$ and $\nu_{5}$ bands which are strongly perturbed by the $x-y$ Coriolis and $2. 1''$ I-type interactions ($E_{2} = 1453.658 cm^{-1}$ and $E_{5} = 1465.576 cm^{-1}$). Combination differences were generated from these wavenumbers to determine very precise ground state parameters of $^{13}CH_{3}F$. The results of a computer search for the coincidences between the energy levels of the ortho-and para-states of $12CH_{3}F$ and $^{13}CH_{3}F$ were used in a new theoretical interpretation of the ortho-para conversion rates in both molecules. Description: Author Institution: Laboratoire de Spectroscopic Hertzienne., Universite de Lille I. F.; J. Heyrovsky Institute of Physical Chemistry and Electrochemistry., Czech Academy of Sciences.; Physikalisch Chemisches Institut., Justus-Liebig Universitat.; Institute of Applied Physics., Russian Academy of Sciences.; Huygens Laboratory., Leiden University URI: http://hdl.handle.net/1811/18689 Other Identifiers: 1993-WE-3