# CORIOLIS EFFECTS AND INTENSITY BORROWING IN THE OUT-OF-PLANE BENDING FUNDAMENTALS OF HCOCl AND DCOCl.

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 Title: CORIOLIS EFFECTS AND INTENSITY BORROWING IN THE OUT-OF-PLANE BENDING FUNDAMENTALS OF HCOCl AND DCOCl. Creators: Joo, D.- L.; Clouthier, Dennis J.; Merer, A. J. Issue Date: 1995 Publisher: Ohio State University Abstract: The $\nu_{6}$ (out-of-plane bending) fundamentals of the transient molecules formyl chloride, HCOCl, and deuteroformyl chloride, DCOCl, have been recorded at high resolution and rotationally analyzed. In HCOCl, the strong lines obey C-type selection rules although there are many weaker lines involving $\Delta K_{a} = 0$. Although ab initio calculations suggest that the $\nu_{6}$ fundamental should be too weak to be observed, it gains intensity by Coriolis interaction with the $\nu_{4}$ fundamental $193 cm^{-1}$ to lower energy, accounting for the presence of the $\Delta K_{a} = 0$ lines. Perturbations due to the $2 \nu_{5}$ level at higher energy have also been observed and fitted with a two-state interaction model. In DCOCl, the $\nu_{6}$ band has the appearance of an A-type band, as the $\Delta K_{a} = 0$ lines predominate and the C-type component could not be found. In this case, the intensity borrowing from the $\nu_{4}$ fundamental $81 cm^{-1}$ lower in energy predominates, overwhelming the very weak $\nu_{6}$ band. A weak $\Delta K_{a} = |2|$ perturbation was found at high ${K^{\prime}}_{a}$ values allowing us to fit the $\nu_{6}$ and $\nu_{4}$ bands simultaneously with a single interaction constant. Description: Author Institution: University of Kentucky, Lexington, KY 40506-0055; The University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada V6T 1Z1 URI: http://hdl.handle.net/1811/29893 Other Identifiers: 1995-FA'-03