THE MICROWAVE SPECTRUM OF METHYLENE CYCLOBUTANE.
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Date
1965
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Publisher
Ohio State University
Abstract
Rotational transitions of methylene cyclobutane in the first seven levels of the low-frequency ring-puckering vibration have been observed. The transitions for the $v=0$ and $v=1$ states are strongly perturbed by a coupling between rotation and vibration and could not be fit with a rigid rotor model. A similar, but much smaller, perturbations can be seen for the $v = 2$ and $v = 3$ states. The perturbation is adequately explained by assuming that the first two vibrational levels are nearly degenerate. The Hamiltonian describing this perturbation was first discussed by $Lide^{1}$ for cyanamide and later used by Butcher and $Costain^{2}$ to explain the spectrum of cyclopentene. Calculations show that the inversion splitting in methylene cyclobutane is about 33600 Mc.
Description
$^{1}$ D. R. Lide, Jr., J. Mol. Spectroscopy 8, 142 (1962). $^{2}$ S. S. Butcher and C. C. Costain, J. Mol. Spectroscopy 15, 40 (1965).
Author Institution: Department of Chemistry, Stanford University
Author Institution: Department of Chemistry, Stanford University