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High-resolution infrared spectra of the ν6 fundamental asymmetric axial S–F stretching vibrational mode of 32SF4 have been recorded in absorption at 296 K using a Fourier-transform infrared (FTIR) spectrometer. The band is centred at 729.7 cm−1. In total, 1550 a-type vibration–rotation transitions have been assigned. Analysis of the data has yielded precise spectroscopic constants for the ν6=1 state, as well as revised constants for the ground vibrational state. Other features in the FTIR spectra are attributed to difference-band transitions from excited vibrational levels of the ν4 and ν9 vibrational modes. [Copyright &y& Elsevier]