Abstract
Laser-Induced Fluorescence (LIF) has been used for the detection of ammonia molecules, NH<sub>3</sub>, in flames at atmospheric pressure. Excitation was accomplished by a two-photon step from the ground state, <i>X</i>, to the <i>C</i>' state, with the detection of the fluorescence radiation from the <i>C</i>' state to the <i>A</i> state. This excitation scheme was also utilized for the simultaneous flame detection of OH and NH<sub>3</sub>. NO could also be simultaneously detected with the laser beam resulting from frequency mixing of the IR beam and the doubled dye laser beam from a Nd:YAG-based laser system.
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