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The 193 nm output of an ArF laser is utilized in the detection of gas-phase ammonia in methane–air flames of varying stoichiometry. Photolysis of ammonia with the 193 nm radiation results in NH photofragment fluorescence—the intensity of which is found to be proportional to the concentration of the ammonia present. Detection limits of <1 ppm of gas-phase ammonia are readily achievable under atmospheric flame conditions. Two-dimensional images of ammonia decomposition have been obtained for a laminar premixed flame, clearly revealing the conical reaction zone. Thermal decomposition of the ammonia is observed in the pre-flame zone of the burner in addition to its oxidation in the reaction zone.

Articles you may be interested inApparatus for the measurement of the speed of sound of ammonia up to high temperatures and pressures Rev. Sci. Instrum. 85, 084901 (2014); 10.1063/1.4891795 Simultaneous detection and identification of multigas pollutants using filament-induced nonlinear spectroscopy A charge-coupled device-based laser photofragment fluorescence spectrometer for detection of mercury compounds Rev. Sci. Instrum. 70, 4180 (1999); 10.1063/1.1150049Design and performance of a belt-type high pressure, high temperature apparatus Rev.A high-pressure, high-temperature apparatus has been developed for the analysis of sorbents capable of removing alkali compounds to the concentration levels required by advanced, coal-fired power generating systems. The reactor is capable of operating at temperatures up to 1200°C and pressures up to 2.0 MPa. A laser-based technique-photofragment fluorescence-enables in situ analysis of the sodium content in a gas stream before and after a sorbent bed thereby determining the efficiency of the alkali removal by the various sorbents studied ͑typically alumino-silicate clays͒. The design and development of both the reactor and the laser-based analytical technique is described.

A high pressure, high temperature apparatus has been developed for the analysis of sorbents capable of removing alkali compounds to the concentration levels required by advanced, coal-fired power generating systems. The reactor is capable of operating at temperatures up to 1200°C and pressures up to 2.0 MPa. A laser-based technique -photofragment fluorescence -enables in-situ analysis of the sodium content in a gas stream before and after a sorbent bed thereby determining the efficiency of the alkali removal by the various sorbents studied (typically aluminosilicate clays). The design and development of both the reactor and the laser-based analvtical technique is described.