Abstract
The reactions of C atoms and CH radicals with nitrogen and nitric oxide were studied behind reflected shock waves. Mixtures of ethane and methane highly diluted in argon were shock heated and served as C and CH sources. Pertubations by addition of N2 or NO result in changes of C atom concentrations and lead to N atom formation. Both atomic species were monitored in the post shock reaction zone by using atomic resonance absorption spectroscopy (ARAS). The rate coefficient of C atom reactions with NO and N2 could be directly determined from the measured C atom concentrations in the temperature range 2720≤T≤3810 K and 2350≤T≤3290 K respectively. C+NO⇌k29productsC+N2⇌k30CN+Nk29=2.0×1013cm3s−1k30=4.5×1012exp(−22000K/T)cm3mol−1s−1 From N atom measurements, the rate coefficient for the reaction CH+N2⇌k31HCN+Nk31=6.1×1011exp(−7000K/T)cm3mol−1s−1 was obtained. The experiments were performed in the temperature range 2340≤T≤3150 K.
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