Abstract
The ν 3 bands of HOBr around 16 μm have been recorded using high-resolution Fourier-transform absorption spectroscopy. More than 800 lines of the two main isotopomers, HO 79Br and HO 81Br, with K a values up to 4 and J values up to 41 have been assigned. Rotational and centrifugal distortion constants of the v 3=1 states were determined from a non-linear least-squares fit using an A-reduced Watson-type Hamiltonian. The results improve Hamiltonian constants determined previously from microwave spectroscopy, and accurate vibrational band centers are determined for the first time: 620.22855 (25) and 618.90606 (25) cm −1 for the HO 79Br and HO 81Br isotopomers, respectively.
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