# DETERMINATION OF THE SPECTROSCOPIC CONSTANTS OF A DARK VIBRATIONAL STATE FERMI AND CORIOLIS PERTURBATIONS IN THE $\nu_{2}$ BAND OF FORMYL CHLORIDE

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 Title: DETERMINATION OF THE SPECTROSCOPIC CONSTANTS OF A DARK VIBRATIONAL STATE FERMI AND CORIOLIS PERTURBATIONS IN THE $\nu_{2}$ BAND OF FORMYL CHLORIDE Creators: Clouthier, Dennis J.; Joo, D.- L.; Merer, A. J. Issue Date: 1994 Publisher: Ohio State University Abstract: The $\nu_{2}$ (CO stretching) fundamental of the transient molecule formyl chloride, HCOCl, has been recorded at high resolution and rotationally, analyzed. Numerous excited state perturbations occur throughout the band, caused mainly by $|\Delta K_{a}|=2$ Fermi resonance and $|\Delta K_{a}|=1$ Coriolis interactions with the $3^{1}5^{1}$ vibrational state. Even though no extra” lines resulting form the perturbations could be assigned, a complete analysis of the perturbed rotational structure has been possible. Accurate molecular constants for both the bright” perturbed $2^{1}$ state and the dark” $3^{1}5^{1}$ perturbing state have been obtained, using a Hamiltonian which includes both the Fermi and Coriolis interactions; only two interaction parameters are needed, one for each mechanism. Further perturbations at high $K_{a}$ are assigned to Coriolis interactions with the $5^{2}6^{1}$ level. Description: Author Institution: Department of Chemistry, University of Kentucky; Department of Chemistry, The University of British Columbia 2036 Main Mall URI: http://hdl.handle.net/1811/13116 Other Identifiers: 1994-RB-02