Fourier transform infrared spectroscopic study of Br2O and OBrO

Vibrational frequencies of gaseous Br2O and OBrO were observed using the Fourier transform infrared spectrometer. For the first time, bands at 629.0 cm−1 (ν3) and 532.9 cm−1 (ν1) were recorded for both Br–O asymmetric and symmetric stretching vibrations of gaseous Br2O. Two fundamental vibrations were observed at 798.7 cm−1 (ν1) and 846.3 cm−1 (ν3) for the O18BrO radical. In addition, two new peaks at 2333 cm−1 and 668 cm−1 were observed in a HOBr spectrum. They are tentatively assigned to the H–Br and Br–O stretching vibrations of a HOBr isomer on the basis of ab initio computational results.