Formation of NH from Shock-Heated Ammonia

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Abstract
Mixtures of ammonia in xenon were shock heated to temperatures in the range 2900° to 9600°K and the radiation from NH was monitored at 3360 Å. It was found that the production of NH (A3II) was second order in initial ammonia concentration within experimental error, and could be described by a rate constant K=4×10—14 exp ( —54 000/T) cm3 molecule—1·sec—1. Significant changes in shape of the radiation profiles were observed at different temperatures; in particular it was found that NH normally decayed at two different rates, one being half as great as the other. The results are discussed and compared with recent measurements made by other authors, revealing some discrepancies that could not be explained.

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