Infrared emission from the &ngr;3 band of ozone near 9.6 μm has been observed in the COCHISE cryogenic chemical reactor/spectrometer. Vibrationally excited O3, formed principally by recombination of O2 with discharge-produced oxygen atoms at 1 torr and 80--120 K, is expanded into a low-pressure (~3 mtorr) environment where its infrared radiation is observed without interference from infrared background effects. The observed spectral distributions are interpreted by using a least squares/spectral synthesis method, in which the vibrational state populations and spectroscopic parameters are adjusted in computed spectra so as to provide the best fits to the observed spectra. The (001)→(000) transition is responsible for most of the observed intensity; however, (Δ&ngr;3 = 1) emission from higher vibrational levels is also seen, extending to ~11 μm (&ngr;3'~6). Although the observed spectral distributions are affected by collisional deactivation occuring in the discharge region, the apparent degree of vibrational excitation observed in these experiments should have considerable bearing on investigations of infrared radiation in the upper atmosphere.