Abstract
The vibrational satellite structure in the low J rotational spectra of tertiary butyl cyanide has been reexamined and all satellites up to 550 cm −1 have been assigned. Millimeter-wave spectra with resolved rotational structure were observed for the two lowest excited vibrational states, v β = 1 and v τ(a) = 1, and values for the relevant spectroscopic constants were derived. The l-resonance splitting in the state v β = 1 is found to be intermediate in magnitude between the relatively small splitting typical of molecules with one methyl top and the very strong splitting observed in tertiary butyl fluoride, and a characteristic separation out of one of the Kl - 1 branches is observed.
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