THE SUBMILLIMETER-WAVE SPECTRUM OF TRANS-AND CIS-CROTONONITRILE $(CH_{3}CH=CHCN)$
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Date
2000
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Ohio State University
Abstract
The ground state rotational spectrum and ground state rotational torsional spectrum of trans-and cis-crotononitrile are further characterized in the 270-480 GHz frequency range. The A-E splittings due to methyl internal rotation in $transcrotononitrile^{a}$ are not observed in the sub-millimeter spectrum which has been assigned and fit to a semi-rigid rotor Hamiltonian in agreement with previous $work^{b}$. For cis-crotonoitrile over 380 transitions are now assigned to this conformation, twice the number previously reported. Internal rotation splittings are observed throughout the $^{a} R$ --- branches and have been assigned for $J > 30$. The A-E spectrum fits reasonably well in an internal axis system, but strong correlation between $D_{ab}$ and the rotational constants indicates that a rotated internal axis system may suit the data better.
Description
$^{a}$M. Suzuki and K. Kozima, {J. Mol. Spec. 33, 407-413 (1970); S.L. Hsu and W. H. Flygare, J. Mol. Spec. 37, 92-99 (1971). $^{b}$A. G. Lesarri, J. Cosleou, X. Li, G. Wlodarczuk and J. Demaison, J. Mol. Spec. 172, 520-535 (1995).
Author Institution: Jet Propulsion Laboratory, California Institute of Technology
Author Institution: Jet Propulsion Laboratory, California Institute of Technology