A TORSION-ROTATION-VIBRATION INTERACTION ANALYSIS OF THE LOWEST IN-PLANE BEND AND FIRST EXCITED TORSIONAL STATE ROTATIONAL SPECTRUM OF THE $C_{3V}$ INTERNAL ROTOR $C_{2}H_{5}CN$
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Date
1998
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Ohio State University
Abstract
The close proximity of the bend and torsion states of $C_{2}H_{5}CN$ (Propionitrile or ethyl cyanide) and their low lying $(206 cm^{-1}$) nature make them an ideal choice for a millimeter- and submillimeter-wave high resolution study of the complex and largely unexamined interactions among torsion, vibration and rotation in a simple $C_{3V}$ internal rotation case. In order to understand the fine details of these interactions, several thousand rotational transitions in the lowest excited in-plane bend and first excited torsional state have been recorded, assigned and analyzed in the 80-422 GHz spectral region. The analysis of the data reveals very strong a- and b-type Coriolis interactions and a number of other smaller interactions. The relative importance and the physical origins of the coupling among the rotational, vibrational and torsional motions will be presented along with a full spectroscopic analysis. A number of important implications for other $C_{3V}$ torsion-rotation-vibration systems will be elaborated.
Description
Author Institution: Jet Propulsion Laboratory, California Institute of Technology; Department of Physics, University of New Brunswick