Abstract
Singlet methylene ( 1CH 2) and the formyl radical (HCO) have been studied in a premixed flat flame of CH 4 and air by cavity ring-down spectroscopy at 1 atm. The absorption lines lie in the same spectral region for both species. The 1CH 2 radicals were probed via the b̃ 1B 1 (0,13,0) ←ã 1A 1 (0,0,0) band at 622 nm and the HCO radicals via the à 2A′ (0,9,0) ←X̃ 2A″ (0,0,0) band at 615 nm. Absolute concentrations of 1CH 2 and HCO have been obtained at various heights above the burner and compared to numerical simulations using both the GRI-Mech 2.11 and 3.0 mechanisms, showing relatively good agreement.
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