OPTOTHERMAL- INFRARED AND PULSED-NOZZLE FOURIER-TRANSFORM MICROWAVE SPECTROSCOPY OF RARE $GAS-CO_{2}$ COMPLEXES
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Date
1988
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Ohio State University
Abstract
Sub-Doppler infrared spectra of $Ne-CO_{2}, Ar-CO_{2}$, and $Kr-CO_{2}$ have been recorded near 3613 and $3715 cm^{-1}$, in the region of the $2\nu_{2}^{0}+\nu_{3}/\nu_{1}+\nu_{3}$ Fermi diad of $CO_{2}$. using an optothermal molecular-beam color-center laser spectrometer. In addition, pulsed-nozzle Fourier-transform microwave spectra are reported for the ground vibrational states of the complexes. The infrared and microwave spectra are consistent with T-shaped complexes as shown originally by Steed, Dixon, and $Klemperer^{1}$ for $Ar-CO_{2}$. The infrared band origins for the Ar and Kr complexes are red shifted, from that of free $CO_{2}$, by 1.09 and $0.95 cm^{-1}$ for $Ar-CO_{2}$ and by 1.97 and $1.76 cm^{-1}$ for $^{84}Kr-CO_{2}$. For $Ne-CO_{2}$, blue shifts of 0.15 and $0.19 cm^{-1}$ are observed. The lower Fermi components are free of perturbations, whereas the upper components of $Ar-CO_{2}$ and $Kr-CO_{2}$ are perturbed. For $Ar-CO_{2}$ the perturbation is strong. shifting the positions of the observed Q-branch lines of the $K_{a}=1 \leftarrow 0$ subband by as much as 500 MHz.
Description
$^{1}$ J. M. Steed, T. A. Dixon, and W. Klemperer, J. Chem. Phys. 20. 4095 (1979).
Author Institution: Molecular Spectroscopy Division, National Bureau of Standards
Author Institution: Molecular Spectroscopy Division, National Bureau of Standards