HIGH RESOLUTION INFRARED SPECTROSCOPY OF $CO_{2}-N_{2}O$
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Date
1996
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Ohio State University
Abstract
The absorption spectrum of the weakly bound cluster $CO_{2}-N_{2}O$ has been observed by probing the $v_{3}$ asymmetric stretch of $CO_{2}$ near $2350 cm^{-1}$. Clusters were formed by supersonic expansion of a mixture of $N_{2}O:CO_{2}$ in a 4:1 ratio using He as the carrier gas. Etalon, reference and signal spectra were recorded simultaneously using a transient digitizer and 386 PC. A nearly planar slipped parallel geometry is observed with the O of NNO nearly over the C of $CO_{2}$. $R_{cm}$ and $\theta$ are 3.05\AA and $59^{\circ}$, assuming the $CO_{2}$ and $N_{2}O$ are parallel and planar. Both parallel and perpendicular transitions were observed. Approximately 270 lines have been assigned. The ground state rotational constants A, B, and C are 0.294924(12) $cm^{-1}$, 0.058004(6) $cm^{-1}$, and 0.048400(6) $cm^{-1}$, respectively. The quartic centrifugal distortion constants are $D_{j} = 5.03(17)\times 10^{7}$ $cm^{-1}$, $D_{jk}= -3.92(9)\times 10^{6}$ $cm^{-1}$, $D_{k} = 1.26(2)\times 10^{5}$ $cm^{-1}$, $\delta_{j} = 1.61(92)\times 10^{8}$ $cm^{-1}$, $\delta_{k} = 1.77(80)\times 10^{6}$ $cm^{-1}$.
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Author Institution: Department of Chemistry, University of Southern California