IR SPECTRUM OF THE $CO-N_{2}$ COMPLEX: ASSIGNMENTS FOR $CO-paraN_{2}$ AND OBSERVATION OF A BENDING STATE FOR $CO-orthoN_{2}$
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Date
2000
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Publisher
Ohio State University
Abstract
The infrared spectrum of the weakly-bound complex $CO-N_{2}$ has been studied using a pulsed supersonic slit-jet and a rapid-scan tunable diode laser. A mirror system giving 182 passes of the laser through the jet helped to give improved spectra with lower effective rotational temperatures (0.5 to 4 K) and less interference by CO dimer transitions. In the case of the $CO-paraN_{2}$ spin modification, for which only one subband was $previously^{a}$ known, over 10 linked subbands were assigned in terms of three ground $(v_{CO} = 0)$ state stacks of levels (with K= 0 and 1), and 7 excited state $(v_{CO} = 1)$ stacks (with K = 0, 1, and 2). The infrared analysis relied sin precise ground state energy level differences obtained from microwave $data.^{b}$ There is a strong Coriolis interaction between the K = 0 and 1e stacks of levels in both the ground and excited states. However, their energy ordering changes, with K = 0 being lower for $v_{CO} = 0$, and K= 1 being lower for $v_{co} = 1$, For the more abundant nuclear spin modification of the complex, $CO-orthoN_{2}$ an excited bending state was observed for the first time. The bending frequency is $4.67 cm^{-1}$.
Description
$^{a}$Y. Xu and A R. W. McKellar, J. Chem Phys. 104, 2488(1996). $^{b}$Y. Xu and W. J\""ager, J. Chem. Phys., submitted (2000).
Author Institution: Steacie Institute for Molecular Sciences, National Research Council of Canada; Department of Chemistry, University of Alberta
Author Institution: Steacie Institute for Molecular Sciences, National Research Council of Canada; Department of Chemistry, University of Alberta