Abstract
Time‐resolved laser‐induced fluorescence measurements of the total removal rate constants of electronically excited states of the NH and CH radicals have been obtained in a variety of low‐pressure (5 to 20 Torr) flames. The NH(A 3Π) removal rate constants have been examined for flames containing N2O as an oxidizer and source of nitrogen. The NH fluorescence quantum yields decrease significantly in the early portion of the flame where the temperature is lower and become constant farther away from the burner. For CH, the B 2Σ− removal rate constant is about 70% faster than that of the A 2Δ in several hydrocarbon/oxygen stoichiometric flames; both rates do not vary significantly from flame to flame. The CH removal rate constants for both electronic states are constant or show a slight increase from the burner surface into the burnt gases for all the flames. Temperature profiles are obtained using excitation scans over several rotational levels for CH and NH.
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