High-resolution FTIR spectra of chlorodifluoromethane (R22) were measured both at room temperature and cooled to approximately −100 °C in a collisional cooling cell. A rovibrational analysis was performed for ν 2, the a/c-hybrid band at 1313 cm −1 and ν 7, the b-type band at 1351 cm −1 . 7400 and 1700 lines were assigned to CH 35ClF 2 and CH 37ClF 2, respectively, with quantum numbers up to J=98 and K a=46. Effective constants to the sextic level have been fitted using Watson's A-reduction Hamiltonian. More accurate spectroscopic constants were obtained by fitting the two states simultaneously, taking into account both first- and second-order c-axis Coriolis interactions between the two bands. The ν 2 band is predominantly a-type, but weaker c-type transitions assigned for CH 35ClF 2 enable the a/c-hybrid character ( μ a 2/ μ c 2) to be determined as 5.76.