THE NU(1) BAND OF HOBR

The nu(1) band of HOBr centered at 3614.903 cm(-1) has been observed a t 0.006 cm(-1) resolution. The band is a hybrid type with \(partial de rivative mu(b)/partial derivative Q(1))/(partial derivative mu(a)/part ial derivative Q(l))\ approximate to 0.84. The spectra of both bromine isotopes have been simultaneously fitted with a single calculation wh ich includes all the previously reported rotational transitions. There appear to be no strong local perturbations to complicate the fitting of the line positions. Precise parameters are reported for the upper s tates as well as improved parameters for the ground states of both spe cies. There is a prominent Herman-Wallis effect for the b-type transit ions, which is well described by linear and quadratic terms in K-a. Th e equilibrium structure has been calculated. (C) 1995 Academic Press, Inc.