ROTATIONAL SPECTRUM OF $N_{2}-CO$: THE $ORTHO-N_{2}$ AND $PARA-N_{2}$
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Date
1999
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Publisher
Ohio State University
Abstract
Observations of the infrared spectra of $N_{2}-CO$ by diode laser spectroscopy have been reported $previously^{a b}$. The present study is an observation of the rotational spectra of $^{14}N_{2}-CO, {^{15}}N^{14}N-CO$, and $^{15}N_{2}-CO$ using a Fourier transform microwave spectrometer. Two sets for the $J = 2-1, 3-2$, and 4-3 transitions are observed for $^{14}N_{2}-CO$ and $^{15}N_{2}-CO$, while only one set for $^{15}N^{14}N-CO$. The hyperfine structures are observed for the complexes containing $^{14}N$ nucleus. The first set is assigned to the K=0 state of $ortho-N_{2}$ and the second to the K=1 state of $para-N_{2}$, based on the infrared analysis and eQq splittings. The transitions with the $K=1$ state are stronger than those with the $K=0$ state for $^{14}N_{2}-CO$ complex, while the reversed is observed for $^{15}N_{2}-CO$. In the case of $^{15}N^{14}N-CO$ only lowest transition is observed because of lack of symmetry in the complex. The nuclear electric quadrupole coupling constant of the $^{14}N$ nucleus is much smaller than related complexes. The value of the van der Waals stretching frequency for $N_{2}-CO$ is calculated to be $19 cm^{-1}$ from the rotational and the centrifugal distortion constants obtained. We concluded that both moieties, $N_{2}$ and CO, are rotating almost freely in the complex $N_{2}-CO$.
Description
$^{a}$ Y. Kawashima and K. Nishizawa, Chem. Phys. Lett. 249, 87 (1996) $^{b}$ Y. Xu and A.R.W. McKellar, J. Chem. Phys. 104, 2488 (1996).
Author Institution: Department of Applied Chemistry, Kanagawa Institute of Technology; Department of Chemistry, Kyoto University; Graduate School of Art and Science, University of Tokyo
Author Institution: Department of Applied Chemistry, Kanagawa Institute of Technology; Department of Chemistry, Kyoto University; Graduate School of Art and Science, University of Tokyo