FOURIER TRANSFORM MICROWAVE SPECTROSCOPY OF $Ar-N_{2}O$ AND $HCCH-N_{2}O$
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Date
1996
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Ohio State University
Abstract
The rotational spectra of two $N_{2}O$ complexes, $Ar-N_{2}O$ complexes, $Ar-N_{2}O$ and $HCCH-N_{2}O$, have been studied using a pulsednozzle Fourier transform microwave spectreometer of the Balle-Flygare type in the 8 - 16 GHz region.Although the rotational spectrum of $Ar-N_{2}O$ was first observed by Klemperer and coworkers, $^{1}$ each rotational transition took many hours of signal averaging and yet the hyperfine components were not resolved. Thus, the spectroscopic constants and structural parameters were not well determined. Likewise, because the dimer $HCCH-N_{2}O$ was observed by Muenter and $coworkers^{2}$ in the infrared, no hyperfine structure was resolvable. We have observed 7 rotational transitions for $Ar-N_{2}O$ (2 are a type and 5 are b type) and 17 transitions for $HCCH-N_{2}O$ (8 are a type and 9 are b type). The spectral lines are split into many hyperfine components due to the presence of the two quadrupolar $^{14}$N nuclei. The Spectra are analyzed using the Watson A-reduced Hamiltonian with the inclusion of hyperfine interactions to yield accurate spectroscopic parameters and angular information.
Description
$^{1}$C. H. Joyner, T. A. Dixon, F. A. Baiocchi, and W. Klemperer, J. Chem. Phys. 75, 5285(1981). $^{2}$T. A. Hu, L. H. Sun, and J. S. Muenter, J. Chem. Phys. 95, 1537 (1991).
Author Institution: Department of Chemistry, Mount Holyoke College
Author Institution: Department of Chemistry, Mount Holyoke College