Abstract
Two-photon Degenerate four-wave mixing (DFWM) has been used for the detection of ammonia in a cell and in an atmospheric pressure flame. The NH3 molecules were excited from the ground state X to either the C' or the B state and the DFWM signal was recorded simultaneously with the laser-induced fluorescence signal, originating from the C′-A and B-A transitions, respectively. During the flame experiments sequential measurements of NH3 and OH in an NH3/O2 flame were also performed.
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