Laser-Induced Fluorescence Detection of NH 3 in Flames with the Use of Two-Photon Excitation

Abstract

Laser-Induced Fluorescence (LIF) has been used for the detection of ammonia molecules, NH₃, in flames at atmospheric pressure. Excitation was accomplished by a two-photon step from the ground state, X, to the C′ state, with the detection of the fluorescence radiation from the C′ state to the A state. This excitation scheme was also utilized for the simultaneous flame detection of OH and NH₃. 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.

Keywords

Analysis for combustion processes Flame spectroscopy Fluorescence

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