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~ 6 4 1 0 ~ 1}1~ \ D'''~. The homogeneous diss~ciation rate of carbon dioxide, diluted with large amounts of argon, was mea~d m ~ shock tube by two mdependent methods: (a) by the single-pulse technique, in which the gas reacts behind a reflected shock,. is qU~D(:~ed by a rarefaction wave, and is later analyzed chemically; and (b) by measurements of light mtenslty ill the blue continuum due to C02 (3II)->C02 (12:) +hp. The results of the two experiments agree. The rate is given by d[CO]/dt = k[C02][M], with k=3X 10 u Ti exp(-86000/ RT) cm S moles-I sec l • Dissociation evidently does not proceed directly from ground-state CO2 to ground-state CO and O. ~he mechanism probably involves the intermediate electronically excited state CO2(3II), the rate-controlJmg process being associated with its formation.