Abstract

A new, combined, pulse pyrolysis supersonic jet and infrared diode laser absorption experiment has been developed for the study of free radicals. The ν 2 fundamental band of the methyl radical has been detected in this experiment using a pulsed nozzle/laser frequency modulation technique. The high nozzle temperature (1500 K) and short contact time (<20 μs) produce a high-density, clean methyl radical source. The rotational temperature of CH 3 was measured to be between 30 and 45 K, indicating efficient cooling after the expansion. The minimum detectable absorption coefficient is estimated to be 3×10 −6 cm −1.

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