The nature of turbulence and mixing in a reactor used by Toor for kinetic studies was investigated in detail. Simple empirical methods were useful for estimating the decay of the scalar fluctuations. An equation, based on continuity, was used with measured velocities and an improved procedure at the inlet to calculate results that agree well with the kinetic data.

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A measurement program currently underway at Calspan to determine the excitation cross section (a*) for the interaction of CO2 and H2O molecules with atomic oxygen is described. A shock -tube technique is used to drive a monoenergetic stream of atomic oxygen, in a helium plus argon diluent, into a jet of target gas injected normal to the incident beam.Subsequent radiation resulting from the collisional interaction of the highly expanded beams is observed immediately downstream using a filtered indium antimonide detector. With this experimental technique, measurements have been obtained for interaction velocities in the range of 4.5 to 7 km /sec.*