The high resolution infrared absorption spectrum of CH₂D⁸¹Br has been recorded by Fourier transform spectroscopy in the range 550–1075 cm1, with an unapodized resolution of 0.0025 cm^-1, employing a synchrotron radiation source. This spectral region is characterized by the ν₆ (593.872 cm^-1), ν₅ (768.710 cm^-1) and ν₉ (930.295 cm^-1) fundamental bands. The ground state constants up to sextic centrifugal distortion terms have been obtained for the first time by ground-state combination differences from the three bands and subsequently employed for the evaluation of the excited state parameters. Watson’s A-reduced Hamiltonian in the I^r representation has been used in the calculations. The ν₆=1 level is essentially free from perturbation whereas the ν₅=1 and ν₉=1 states are mutually interacting through α-type Coriolis coupling. Accurate
spectroscopic parameters of the three excited vibrational states and a high-order coupling constant which takes into account the interaction between ν5 and ν9 have been determined.