VIBRATION-ROTATION SPECTRUM OF CARBON DIOXIDE-ACETYLENE
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Date
1988
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Publisher
Ohio State University
Abstract
The infrared spectrum of carbon dioxide-acetylene has been recorded in the three micron wavelength region by observing direct absorption of color center laser radiation by a pulsed molecular beam. The spectrum is that of a perpendicular transition in a moderately asymmetric prolate rotor. The vibrational origin is $3281.740 cm^{-1}$ and the rotational constants are $A^{\prime \prime}=8876, B^{\prime \prime}=2859, C^{\prime \prime}=2155, A^{\prime}=8864, B^{\prime}=2855$, and $C^{\prime}=2154$ MHz. The axes of the two monomer molecules are parallel and the complex has $C_{2v}$ symmetry. The separation of the monomer units is 3.285 A. This geometry is readily predicted by considering the quadrupole-quadrupole interaction. Since the monomers have quadrupole moments of opposite sign, this configuration places positive regions of each monomer opposite negative regions of the other. A more detailed model of electrostatic interactions between distributed multipole moments will also be discussed.
Description
Author Institution: Physical Chemistry Laboratory, Oxford University; Department of Chemistry, University of Rochester