Abstract
The millimeter-wave rotational spectra of79BrNO and81BrNO in thev2= 1 andv3= 2 vibrational states have been reinvestigated. Measurements of the rotational spectrum in the region of maximumc-type Coriolis interaction between the two states allowed the previous analysis to be extended to account for some uncommon effects. For the most perturbed transitions the nuclear quadrupole hyperfine structure arises from coupling of not only the bromine nucleus, but also the nitrogen nucleus with the rotational angular momentum. These effects were satisfactorily fitted with a Hamiltonian describing Coriolis coupling in a molecule with two quadrupolar nuclei. The successful analysis of pure rotational transitions then allowed accurate prediction of rovibrational transitions, six of which were measured for79BrNO and four for81BrNO.
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