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Ammonia detection and monitoring with photofragmentation fluorescence

机译:用光碎裂荧光检测和监测氨

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Excimer laser fragmentation-fluorescence spectroscopy is an effective detection strategy for NH↓(3) combustion exhausts at atmospheric pressure and high temperatures. Two-photon photofragmentation of NH3 with 193-nm light yields emission from the NH(A-X) band at 336 nm. There are no major interferences in this spectral region, and the sensitivity is at the parts per billion (ppb) level. Quenching of the NH(A) state radical by the major combustion products is measured and does not limit the applicability of the detection method. Detection limits in practical situations are of the order of 100 ppb for a 100-shot (l-s) average. This technique could prove useful in monitoring ammonia emissions from catalytic and noncatalytic NO↓(x) reduction processes involving ammonia injection. # 1998 Optical Scciety of America OCIS codes: 120.1740, 300.2530, 300.6360, 300.6410, 300.6540.
机译:准分子激光碎裂-荧光光谱是在大气压力和高温下检测NH↓(3)燃烧废气的有效策略。 NH3的两光子光解和193nm的光从336nm的NH(A-X)谱带发射。在此光谱区域中没有主要干扰,灵敏度为十亿分之一(ppb)的水平。可以测量主要燃烧产物对NH(A)自由基的猝灭,并且不限制检测方法的适用性。在实际情况下,对于100发(l-s)平均值,检测极限约为100 ppb。该技术可用于监测来自涉及氨注入的催化和非催化NO↓(x)还原过程的氨排放。 #1998美国光学学会OCIS代码:120.1740、300.2530、300.6360、300.6410、300.6540。

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