期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 77, 期 5, 页码 541-546出版社
SPRINGER-VERLAG
DOI: 10.1007/s00340-003-1267-7
关键词
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The NH2 radical absolute concentrations were measured using intracavity laser absorption spectroscopy during the process of ammonia pyrolysis at relatively low temperatures of 800-1000 K. The NH2 spectra have been recorded at pressures of 12-380 Torr. The observed absolute concentrations (in the order of - 10(11) molecules/cm(3)) were higher than was predicted by the gas-phase pyrolysis mechanisms. These mechanisms also overestimate the activation energy of the process. The experimental observations can be explained by the existence of an additional channel of NH2 formation - probably on the surface of the reaction vessel. The addition of oxygen to the reaction mixture causes a considerable (- four-fold) increase in the NH2 radical concentration.
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