TORSIONAL SPLITTING AND ASSIGNMENTS IN THE LOW TEMPERATURE DOPPLER-LIMITED SPECTRUM OF THE C-H STRETCHING BANDS OF ETHANE
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Date
1978
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Ohio State University
Abstract
Room $(295^{\circ}\, K)$ and low $(119^{\circ}\, K)$ temperature spectra of the C-H stretching fundamentals of $C_{2}H_{6}$ have been recorded with Doppler-limited resolution using a tunable difference-frequency laser spectrometer. The low temperature spectrum of the dense $\nu_{7}$ and $\nu_{5}$ bands was taken to reduce contributions from torsional ``hot” band lines and to further verify the line assignment. The Doppler line narrowing at low temperature also reveals small unexpected doublet splittings in the $\nu_{7}$ band which are attributed to torsional tunneling because of the 2:1 intensity ratios for lines with K = 3n and 4:1 for lines with $K = 3n \pm 1$. A quantitative explanation of this phenomenon is presently under investigation.
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Author Institution: Lincoln Laboratory, Massachusetts Institute of Technology; Lincoln Laboratory, National Bureau of Standards