MICROWAVE SPECTRA OF TORSIONALLY EXCITED STATES OF NITROETHYLENE.

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1969

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Ohio State University

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Nitroethylene shows a torsional motion of the nitro group with a frequency of $99.5 cm^{-1}$ in the far infrared. In the microwave spectrum, the ground state and five excited torsional states could be measured for the lowest pure rotational transitions. It was already shown that the equilibrium structure is planar. An attempt to explain the variation of the rotational constants and the inertia defect in the different torsional states with the existing theories of Oka and Morino or Lauric and Herschbach failed. The discrepancies mainly arise from the neglect of anharmonic terms in the torsional motion. However, the application of the recently developed theory of hindered internal rotation with $C_{2v}$-type internal rotors gave an excellent fit of the measured spectra.
Author Institution: Laboratory for Physical Chemistry, Swiss Federal Institute of Technology

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