Knowledge Bank

The absorption spectrum of the weakly bound cluster $CO2-N2O$ has been observed by probing the $v3$ asymmetric stretch of $CO2$ near $2350cm-1$. Clusters were formed by supersonic expansion of a mixture of $N2O:CO2$ 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 $CO2$. $Rcm$ and $\theta$ are 3.05\AA and $59\circ$, assuming the $CO2$ and $N2O$ 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 $Dj=5.03(17)\times 107$ $cm-1$, $Djk=-3.92(9)\times 106$ $cm-1$, $Dk=1.26(2)\times 105$ $cm-1$, $\delta j=1.61(92)\times 108$ $cm-1$, $\delta k=1.77(80)\times 106$ $cm-1$.