VIBRATIONAL DEPENDENCE OF CENTRIFUGAL DISTORTION CONSTANTS IN TRIMETHYLENE OXIDES

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1973

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Ohio State University

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Abstract

The microwave spectra of normal and the three symmetrically deuterated species of trimethylene oxide have been observed in the ground and first five excited states of the ring puckering vibration. A total of some 1500 lines have been measured and assigned in the 26.5 to 40.0 GHz region. These data have been fit to an effective Hamiltonian, in each vibrational state, with an average standard deviation of 10 kHz. This Hamiltonian includes rigid rotor, quartic and sextic centrifugal distortion terms only. The quartic parameters exhibit a well determined irregular dependence on the vibrational state. This dependence is explained in terms of the double minimum potential function and the symmetry properties of the distortion constants.

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Present address of R. A. Creswell: Department of Chemistry, Michigan State University, East Lansing, Michigan, 48823.
Author Institution: Department of Chemistry, University of Reading

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