The ν3 bands of HOBr around 16 μm measured by high-resolution Fourier-transform spectroscopy

The nu(3) bands of HOBr around 16mum have been recorded using high-resolution Fourier-transform absorption spectroscopy. More than 800 lines of the two main isotopomers, (HOBr)-Br-79 and (HOBr)-Br-81, with K-a values up to 4 and J values up to 41 have been assigned. Rotational and centrifugal distortion constants of the nu(3) = I 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 (HOBr)-Br-79 and (HOBr)-Br-81 isotopomers, respectively. (C) 2003 Elsevier Inc. All rights reserved.