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E. A. COHEN, B. J. DROUIN, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099; E. A. VALENZUELA, R. C. WOODS, Department of Chemistry, University of Wisconsin, Madison WI 53706-1322; W. CAMINATI, A. MARIS AND S. MELANDRI, Dipartimento di Chimica ``G. Ciamician'' dell'Università, Via Selmi 2, I-40126 Bologna, Italy.
Tertiary-butyl alcohol is a nearly spherical rotor for which the internal rotation axis of the t -butyl group is close to the c molecular axis in the ac plane. Methyl group torsional spittings are not observed in the ground state. Its 8 to 40 GHz rotational spectrum was reported at this meeting by Valenzuela and Woods in 1974 and in more detail in 1975. The parameters derived at that time from a fit to the E states with J,K\le 20 have provided the basis for extending the measurements to > 500 GHz. The combined data set extends to J,K > 50 and is fit with the program spfit using a common set of parameters for both the A and E states. The general features of the spectrum and the fitting procedure will be described. The resulting molecular constants and their interpretation will be discussed.