CORIOLIS INTERACTIONS IN THE $\nu_{3}, \nu_{6}$, AND $\nu_{4}$ BANDS OF $D_{2}C0$
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Date
1976
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The infrared vibration-rotation spectrum of $D_{2}CO$ vapor has been measured in the region from 1200 to $700 cm^{-1}$ with resolution of about $0.07 cm^{-1}$. Three bending bends $\nu_{3}, \nu_{6}$, and $\nu_{4}$ have been resolved and assigned by use of the Loomis-Wood diagrams and the ASSIGN $diagrams.^{1}$ The levels with $K_{a}^{\prime} = 0-8$ (for $\nu_{3}$), $K_{a}\ ^{\prime}= 0-15$ (for $\nu_{6})$ and $K_{a}^{\prime} = 0-14$ (for $\nu_{4})$ are assigned. Besides the strong a-type Coriolis interaction between $\nu_{6}$ and $\nu_{4}$, a c-type Coriolis interaction between $\nu_{3}$ and $\nu_{6}$ and a b-type Coriolis interaction between $\nu_{3}$ and $\nu_{4}$ are observed. By a least-squares fit in the scheme of three-level Coriolis interactions, the molecular constants for the $\nu_{3}, \nu_{6}$, and $\nu_{4}$ states were determined: $\nu_{3} = 1100.44 \ cm^{-1}, \nu_{6} = 989.19 \ cm^{-1}, \nu_{4} = 938.02 \ cm^{-1}, \xi^{a}_{64} = 4.98 \ cm^{-1}, \xi^{c}_{36} = 0.68\ cm^{-1}$, etc. The perturbed intensity distribution of the three bands is best simulated with the relative band moment of $(- 0.4: 1.0: 0.5)$ for $\nu_{3}: \nu_{6}: \nu_{4}).
Description
$^{1}$ (a)W. B. Person and J. H. Newton, J. Chem. Phys. 61, 1040 (1974); the original paper introducing polar tensors was (b) J. F. Biarge, J. Herranz, and J. Morcillo, Anales Real Soc. Espan., Fis. Quim. (Madrid) A57, 81 (1961). $^{2}$ J. H. Newton and W. B. Person, J. Chem. Phys. 64, to be published (1976). Support extended this research by NSF Grant No. MPS-7421471 is gratefully acknowledged.
Author Institution: Department of Chemistry, Faculty of Science, The University of Tokyo
Author Institution: Department of Chemistry, Faculty of Science, The University of Tokyo