INTRACAVITY LASER SPECTROSCOPY OF ELEMENTARY PROCESSES BASED ON A CW RING DYE LASER

An improved version of an intracavity laser spectrometer based on a ring travelling wave dye laser is demonstrated, a rate constant measurement of the HNO + O2 reaction being used as an example. This spectrometer previously shown to have quantum noise limited sensitivity in absorption measurements permits studying slow chemical reactions at very low concentrations of active particles. Efficient algorithm of calculation concentrations of molecules in chemical reaction cell is also developed

Discussion on the formation and removal of NO/sub x/ in ammonia flames

Processes related to NO formation and removal in an ammonia-oxygen flame are discussed in connection with the role of nitrogen-containing intermediates. A rate constant /b k//sub 7/ for the decomposition reaction (N/sub 2/H+M rarr N/sub 2/+H+M) is deduced. According to the rate coefficient /b k//sub 1/ selected for the NH/sub 2/+NO reaction, /b k//sub 7/ amounts to either 1.7*10/sup 13/ exp(-7200 K//b T/) or 1.5*10 /sup 14/*exp(-900 K//b T/) cm/sup 3/ mole/sup -1/ s/sup -1/ in the 1600-2200 K temperature range. The main contribution to NO formation is ascribed to the NH+O/sub 2/ reaction. Products and rate constants of the NH+NO reaction are determined. The role of excited species can be dismissed for NO production.Anglai