Abstract
The technique of resonance enhanced multiphoton ionization has been applied to in situ detection of methyl radicals in high-temperature atmospheric pressure CH 4 pyrolysis. The detection is via three-photon ionization using two-photon resonances to the 3p 2A″ 2 state of CH 3 at 333.5 and 329.5 nm for the 0 0 0 and 2 1 1 bands, respectively. Deuterium isotope shifts in both bands are also observed in CD 4 pyrolysis. The detection sensitivity is estimated to be at the ppm level. The methyl radical concentration profiles are measured as a function of reaction time.
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