VERY HIGH RESOLUTION FOURIER TRANSFORM AND DIODE LASER SPECTRA OF THE $\nu_{9}$ BAND OF $C_{2}H_{6}$
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Date
1981
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Ohio State University
Abstract
The infrared spectrum of the $\nu_{9}$ band of ethane has been recorded with a resolution of $0.004 cm^{-1}$ using a Fourier transform spectrometer. In addition, twelve Q-branches ranging from $^{P}Q_{1} to ^{R}Q_{10}$ have been measured with a diode laser spectrometer capable of Doppler limited resolution ($0.002 cm^{-1}$). The line splittings reported by Flicker et $al.^{1}$, in the Q-branches of this band have been verified and observed in the P- and R-branches as well. Quantum number assignments have been made with the aid of combination differences calculated from well determined ground state $constants.^{2}$ Nuclear spin statistics clearly show that the individual transitions are split into their two torsional components even though torsional splitting for this band would be expected to be un-resolvable. The observed splitting is J dependent and varies from K to K. The large splitting observed probably results from an interaction of the $\nu_{9}$ state with the components of the v - 3 level of the torsional vibration. Preliminary results will be reported. The most recent theoretical work on this molecule was presented by Hougen $^{3}$ and some of the above studies were undertaken as a sequel to the recommendations in his paper.
Description
$^{1}H$. Flicker, R. S. McDowell, N. G. Nereson, and K. Fox, Molecular Spectroscopy Symposium, The Ohio State University, Paper TB5 (1997). $^{2}$ A. S. Pine and W. J. Lafferty. Molecular Spectroscopy Symposium, The Ohio State University, Paper ME12 (1978). $^{3}$ J. T. Hougen, J. Mol. Spectrosc. 82, 92 (1980).
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