Abstract

Total removal rate constants from the NH(A³Π_i) electronic state have been obtained in low pressure (~14-Torr) N₂O flames. The fluorescence decay constants and quantum yields Φ depend on the temperature and composition at each position interrogated in the flame. In similar conditions, Φ for NH(A³Π_u) is significantly greater than that for other radicals CH(A²Δ and B²Σ⁻) and OH(A²Σ⁺). A small decrease (~5%) in the electronic removal is observed with rotational excitation increasing from N′ = 2 to 12 in the A state. Estimates of collisional quenching cross sections at flame temperatures are made for the important combustion species, H₂O, C₃H₈, C₂H₄, and C₂H₂.

© 1989 Optical Society of America

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