Detection of trace species in hostile environments using degenerate four-wave mixing: CH in an atmospheric-pressure flame

摘要: Degenerate four-wave mixing (DFWM) has been used to detect the CH radical in an atmospheric-pressure oxyacetylene flame via (0,0) and (1,1) bands of A 2 Δ-X Π transition. The reliability DFWM assessed by comparing it laser induced fluorescence (L/F) measurements under same experimental conditions. is a minor species (∼30 ppm) important for understanding primary reaction zone many combustion environments. We have observed radicals with comparable sensitivity both techniques