Abstract
The reaction of Fe atoms with NO was studied behind incident shock waves in the temperature range of 780 to 1020 K at pressures between 0.3 and 1.2 bar. Atomic-resonance-absorption spectroscopy (ARAS) was applied for the time-resolved measurement of Fe, N, and O atoms in gas mixtures containing Fe(CO)5 and NO, highly diluted in argon. The experiments showed an Fe-atom consumption without an associated O- or N-atom formation which can be explained by a recombination of Fe and NO: $$ Fe + NO\mathop\to \limits^{k_1 } FeNO. $$ The rate coefficient k1 was obtained from pseudo-first-order analysis of the measured Fe-absorption profiles to be k1=108.99±0.3 exp(7020 ± 840 K/T) cm3/(mol s). It showed an inverse temperature dependency. Variation of the experimental pressure does not have any effect on the rate coefficient.
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